These guides will be helpful for anyone learning how to use a Khadas SBC for the first-time.

Guides:

• VIM1

• VIM2

• VIM3/3L

• Edge/V

• Tone1/2

Tip: You’ll find many helpful people in our Khadas Community.

Using Android OS, you can use SD-cards to augment the limited amount of storage on the eMMC. Make sure that you’re using a modern “high-speed” SD-card; something like a microSDXC UHS-I card will be suitable for this application.

Instructions:

1. Insert your SD-card into your VIM or Edge SBC.

2. Open the “Android-Settings” App (Gear Icon).

3. Select “Storage & Reset”.

4. Select your SD-card under “Removable Storage”.

5. Select “Set up as device storage”.

Tip: If you’ve done the above steps correctly, your SD-card will become a seamless part of your SBC’s eMMC storage. Exercise caution when unplugging your SD-card as some files and photos will become inaccessible! Make sure that you use the OS to “eject” the card first, before removing it physically.

Depending on your use-case, you may want to change/upgrade your Android OS to Ubuntu 18.04, or even run a custom dual-OS ROM. We refer to “operating system” files as “Firmware Images“, .img files, or ROMs. On our server, they are compressed into .7z containers, and will require WinRAR to unpack on Windows OS.

Tip: Changing operating systems will erase ALL the data on your eMMC. Unless the OS is meant to run from a Bootable SD-card (Booting Card), be sure to back-up all your data before following the instructions below.

VIM1/VIM2/VIM3 Upgrading Instructions:

1. Place VIM into Upgrade Mode.

2. Two ways to upgrade:

• Upgrade Using A USB Cable - Burn an .img file to the eMMC, directly from a Ubuntu or Windows Host.

• Upgrade Android Using An SD-Card - Burn an .img file to the MMC, directly from an SD-Card.

Edge Upgrading Instructions:

1. Place Edge into Upgrade Mode.

2. Two ways to upgrade:

• Upgrade Using USB cable - Burn an .img file to the eMMC, from a Ubuntu or Windows Host.

• Upgrade Android Using An SD-Card - Burn an .img file to the eMMC, from an SD-Card.

eMMC image: An eMMC image should be burned directly to the eMMC using a USB-C data cable, from a Ubuntu or Windows Host. It must not be burned into an SD-Card.

• For Example: Android and Ubuntu distributions containing the EMMC mark.

SD/USB image: An SD/USB image should be copied into an SD-Card, before that card is then used to reformat the eMMC storage with a new OS.

• For Example: Armbian, Ubuntu distributions containing the SD_USB mark, as well as LibreELEC and CoreELEC.

Our Affiliate Program allows everyone to promote the Khadas brand whilst simultaneously earning commissions through an affiliate link. Get rewarded by sharing your affiliate link and earning money from every purchase you refer.

1. Join the Affiliate Program and Get Your Khadas Affiliate Link

The first thing you need to do to become a Khadas influencer is to sign up for the affiliate program. The application will require some basic information about your business and your audience. Follow the instructions to complete and submit your application.

After you submit your application, it will typically take a few days for Khadas to approve or deny your application.

Once you’re accepted, you’ll be granted access to your affiliate dashboard, where you can find and copy your unique affiliate referral link.

2. Add Your Referral Link to Relevant Content

You can start monetizing your content right away by adding your Khadas link directly to your blog posts, social medias or website.

Simply find content that shows how Khadas products will fit your audience’s needs.

Next, find the most relevant part of the post, and add your affiliate link with optimized anchor text.

Then all you have to do is keep creating content and wait for your audience to click your links. When they make purchases, you’ll earn 4%-10% per sale.

1. An affiliate promotes Khadas products on Facebook, Youtube, Instagram, or other social media;

2. A potential customer clicks on the social media posts or advertising;

3. The customer orders products from the Khadas Official Website;

4. The affiliate earns 4-10% commission per sale.

1. Easily join for free.

2. Earn 4%~10% commission from each referred sale.

3. Earn extra monthly Cash Bonus for sharing promotional activities.

4. Subscribe to our newsletter to be notified of new products and sale.

5. Continue to earn commission if the same customer buys additional products within 45 days (cookie tracking).

If you have any further questions, please do not hesitate to email us at support@khadas.com.

We will ensure that the performance of Tone2 Pro is higher than the Tone1. After formal tests are conducted with specialized equipment and test benches, we tend to leave this question to the reviewers who will review Tone2 Pro in the coming days. Qualitative sound-quality is highly subjective, with some people preferring a clean and flat output, whilst others prefer a warmer bass and a punchy high-range with more depth and space.

Yes this issue has been resolved in our Tone2 Pro.

The single-end 3.5mm jack is designed with a depop chipset to cancel the pop noise, and has a max of 2.3Vrms output.

The balanced 4.4mm jack is designed to drive higher impedance headphones, and has a higher output at 5.0Vrms or greater; the depop chipset will draw down this performance and does not support higher outputs.

Tone2 Pro cannot view the format and bit-rate of audio streams via S/PDIF. The S/PDIF-IN signal is directly fed into the ESS ES9038Q2M DAC, and bypasses the XMOS XU216 processor.

Commence your ODM project and pay the NRE cost when you are satisfied with the level of detail in both your PRD and the ERD. Experienced clients with in-house engineering teams are highly detailed; they may skip the PRD and send us an ERD. Clients conducting exploratory work or product studies, may only arrive with a PRD. In general, being more detailed results in less surprises and a smooth timeline. Being less detailed creates more space for innovation, but also a more unpredictable timeline and cost structure.

ODM means "original design manufacturer", which is a company that specialises in producing original designs for clients who are called "ODM customers". These designs may then be used to manufacture products for use by retail customers, businesses, the government and military.

PRD means “Product Requirements Document” and should contain high-level information about the product which you intend to build. For example, it could contain the main features, and the user experience stories, labelled and prioritised from most to least important. It should be created with input from stakeholders across your company, as each stakeholder would have their unique requirements regarding your product. A holistic PRD ensures that your product will meet the requirements of both your company and your customers.

ERD means “Engineering Requirements Document”, and is usually written after the first-draft of your PRD. It contains technical details of your product's modules, their operating states, how they interact, the operating environment, required lifetime, obsolescence, and regulatory compliance. It also contains qualifying tests so that engineers can benchmark their designs against the ERD. The ERD will be written by Khadas and will also contain the estimated product BOM cost, timeline and other deliverables.

BOM means "Bill Of Materials", which is a list of parts and materials used to build your product. The BOM is a useful tool to determine the raw material unit-cost of your product. However, it does not include other external costs incurred during your "product's life-time", such as the NRE, Certification, Manufacturing, Shipping, Import Taxes, Green Taxes, Warehousing, Retail, Customer Service, Warranty, and Disposal.

During the development of your product, both the PRD and ERD will change when relevant feedback is collected from your project stakeholders, and the various development teams. When changes are made to the PRD and ERD, their impact on your timeline, costs and product quality must always be considered.

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It will be useful to enforce "version control" for your PRD and ERD, with notes written down on why a particular change was made. Ensure that all stakeholders are aware of the decision, and that they are in agreement.

NRE means "non-recurring engineering", which is a one-time payment made before the start of an ODM project. It can also be split into tranches, paid when a project reaches a certain milestone.

• 50% of the NRE must be paid before Stage 2 begins (Initial Prototype).

• 30% must be paid before Stage 3 begins (Corrected Prototype).

• 20% must be paid before Stage 4 begins (Final Prototype).

Manufacturing is a separate quote from the NRE.

Yes we can do this. If you have specified your target markets in your PRD (usually this is determined by your marketing + management + logistics teams), we can figure out what type of certification is required for the markets that you have specified. Certification costs are not included in the NRE, and will be quoted separately.

​Design files used within your product could be the intellectual property of Khadas (Shenzhen Wesion Technology Co. Ltd.). We understand that some clients need to acquire our design files in order to manufacture their product at home, rather than abroad in China. We are able to transfer the design files (PCB layout, BOM list, Software, Documentation, Source Code, Factory SOP, etc) after the client has paid us a "Design Transfer Fee". This fee varies from project to project.

We have professional designers who can do both Industrial and Mechanical Design for your product.

Shenzhen Wesion Technology Co. Ltd. was founded in 2014. We focus mainly on developing, manufacturing and marketing Amlogic and Rockchip single board computers (SBCs) for ODM customers. We also have our own brand of single board computers, called the Khadas VIM and Khadas Edge.

Yes, you may send an email to: hello@khadas.com.

You can email hello@khadas.com. Or you may search for other suitable products from our shop.

We have listed our distributors and their contact information at khadas.com/distributors.

You may ask for a full-refund at anytime (less Paypal fees), as long as your product has not shipped. Please email hello@khadas.com or contact us via the chat box.

Pre-orders help us gauge the market's desire for a new, untested product. It gives us confidence that there is a real-need, and thus the insight to develop products that more closely meet the desires of our customers.

If you want to listen to lossless audio from subscription streaming services like Apple Music, please use a wired connection from your iPhone to ‘Tea’ using the included Lightning to USB-C converter cable.

Audio received via LDAC and aptX HD bluetooth is still lossy, and experienced audiophiles will be able to tell the difference. For the ultimate listening experience, please use the included USB-C to C cable.

Yes it does. USB: up to 32-bits 384KHz @PCM, or Native DSD 256. Bluetooth: up to 24-bits 96KHz

Yes, Tea supports MQA rendering.

You can use PayPal during our shop checkout.

Yes, you may send an email to: hello@khadas.com.

Customers outside of China may be subject to customs fees and / or import duties and taxes. These could be levied once a shipment reaches your country. You should contact your local customs office or tax authority for information specific to your situation.

Additionally, when ordering from this website, you are considered the importer of record and must comply with all laws and regulations of the country in which you are receiving the goods. Shenzhen Wesion Technology Co. Ltd. will not be held responsible for international orders that never make it past your country’s customs office.

Please check with your customs office before placing your order. No refund will be given for items that are seized by your local customs agents.

In general, the required MOQ varies from product to product, and is related to the BOM cost.

• Trial Run: ~100 units

• Live Run: ~1000 units

• Control all materials and do IQC (we have stable suppliers for each component).

• SMT factory will do full AOI: 1st round full-inspection of every board, focusing on PCBA functionality (We will determine the SOP for the factory).

• Conduct a 4 hour PCBA aging test (for some projects).

• If your product is assembled by us, we will conduct a 2nd round of testing. Qualifying tests would be specified within the ERD.

• Our QC engineers will do a third and final round of testing. Our partners may test more specialised aspects, e.g. Wi-Fi antenna electromagnetic profile.

• We recommend our clients to arrange for 3rd-party / in-house QC personnel to do their own QC of subjective variables, e.g. silkscreen colour printing, before commencement of packaging and shipment.

SOP means "Standard Operating Procedure" which in our case often refers to the factory's SOP. The SOP enables the assembly line workers to produce your product in a timely and accurate fashion; by following a set of sequential steps (procedures), that aims to eliminate assembly error and redundant actions.

We have professional designers who can design product packaging for your products.

Coaxial input. Originally we designed Tone2 Pro to support both Coax IN and OUT via the balanced RCA jack. You can use a standard RCA cable for Coax IN, and a balanced RCA cable for Coax OUT. But Tone2 Pro is likely to only support the Coax IN feature when it ships with the pre-installed firmware.

The XMOS XU216 processer is already maxed-out to achieve all features such as MQA, SPDIF OUT and PCM768. We may release special firmware to support Coaxial OUT for users who want to use the Tone2 Pro as a USB to SPDIF adapter, just note that a special cable(balanced RCA to single-end) is required to support the SPDIF Coaxial OUT.

Yep, 4.0Vrms for balanced RCA mode, and 2.0Vrms for standard RCA mode (single-end).

Tone2 = Tone2 Pro - Headphone Amp - MQA. The Tone2 Pro is based on the XMOS XU216, whilst Tone2 is based on the XU208 (which is also used on Tone1). The Tone2 will have balanced RCA connectors, just like the Tone2 Pro.

Yes the Tone2 Pro supports external bluetooth modules via the secondary USB-C port labelled I2S. Note that the pin-layout of the USB port is non-standard. Users can select the input source using the volume knob (rotary-push encoder). Input sources: USB Data, Bluetooth (via USB-C I2S port), and Coaxial S/PDIF IN

Yes, we built-in a buffer stage amplifier to drive the headphones directly. They are connected with the hardware volume control, and each headphone has an independent amplification pathway. Headphone volume is independent from line-out.

Our official firmware will only control the headphone volume of the headphone jacks, line-out will have a fixed output volume. It’s still possible for volume knob to control the output of line-out via adjusting the volume register of the ES9038Q2M DAC. In that case, there will be two types of volumes:

1. DAC volume (digital) for both line-out and headphone jacks

2. Hardware volume (analog) for headphone jacks only

But we believe two volume controls will be too complex for most users, so we just fix the DAC's digital volume at maximum (highest performance), and only apply hardware volume control for the headphone jacks.

We may release dedicated firmware to enable control of the DAC's digital volume for the line-out, if this is required by specific users in the future.

The Tone2 Pro consumes a maximum of 0.62A at 5V (3.1W) whilst playing PCM 768KHz 32bit music, so any linear power supply in excess of 5W will work just fine.

Nope, the Tone2 is a different product from the Tone2 Pro:

Tone2: DAC only and will be sold as a bare board

Tone2 Pro: DAC + HPA, with MQA support. Will only sell as a finished product.

LINEAR FAST: Linear-phase fast roll-off filter LINEAR SLOW: Linear-phase slow roll-off filter MINI FAST: Minimum-phase fast roll-off filter MINI SLOW: Minimum phase slow roll-off filter APODIZING: Apodizing fast roll-off filter HYBRID FAST: Hybrid fast roll-off filter BRICK WALL: Brick-wall filter Check the document below from ESS official website for further information: http://www.esstech.com/index.php/en/products/sabre-digital-analog-converters/audiophile-dacs/pre-tuned-reconstruction-filters/

The Tone2 Pro's amplifier has a range of 0 to 64dB, and it's firmware supports 32 levels, each level is 2dB; this is controlled via hardware analog volume.

There is no impact on performance when using an LPS and PC USB power supply to feed your Tone2 Pro. You may notice a background-hum when using Mobile Phone Switching Power Supplies, so this is not recommended.

The I2S interface does not need an external MCLK; it is governed entirely with internal clocks.There are three internal clocks at 45.1584m, 49.1520m and 100m. The crystal oscillator of the last USB input source is reserved.

The MagSafe attachment system is designed to only function with iPhone 12 or newer models, however Android phones can be equipped with a “magnetic ring accessory” that will mimic the behaviour of MagSafe. Note that a third-party phone case without a MagSafe ring, will weaken the attraction of the magnets.

‘Tea’ has a 3.5mm single-end headphone jack, and will only work with single-end headphones.

We will produce an adapter or cable for existing products with XLR-3 connectors:

• Balanced RCA to XLR-3 male adapter (0.2m)

• Balanced RCA to XLR-3 male cable (1.0m)

You may purchase them at Khadas Shop.

We will also launch a balanced RCA cable when compatible products like Pre-Amp/Amp/Headphone Amps are available in the market.

The Tone2 Pro packaging is designed to be small to save on space and materials, so only a 1m length USB-C to C cable is provided inside the box. Those who require extra cables and converters can purchase them separately from Khadas Shop.

Yes, we built-in a buffer stage amplifier to drive headphones directly. They are connected with the hardware volume control (volumee knob), and each headphone jack (3.5mm / 4.4mm Pentaconn) has an independent amplification pathway. Headphone volume is independent from RCA line-out.

We are able to ship to almost every country in the world. Just ensure that you enter your address and telephone number correctly.

Your order will not be dispatched, and will remain so, until you update us with a valid telephone number.

We will provide “free shipping” by China Post. Alternatively, you could also pay for express shipping, and your package will arrive within 7 working-days, after dispatch by our express-shipping agent.

If a product is listed as "in-stock", it will take a maximum of 5 working-days from payment, to arrive at our shipping agent. Shipping time is calculated from when the agent has sent out your package.

An email including your tracking number will be sent to you, after your package has been dispatched.

You can check your tracking information from www.17track.net. The website supports multiple-languages.

For China Post, refer to this data-table. The table is only for reference, specific times (10-50 days) are subject to changing shipping conditions. For DHL (Express Shipping), refer to your tracking number.

Usually China Post will update the tracking information to www.17track.net after 8-10 days.

Sometimes your local post office will not update the shipping information so you can’t track it. If this happens, please contact your local postal office, as indicated from 17track.net.

Please contact your local post office regarding delivery issues. It is possible that your post office needs you to pay customs tax.

Your package could have arrived in your country, but failed to deliver to your home. Enter your tracking number on www.17track.net to view your post-office, and contact them for re-delivery.

You can email hello@khadas.com for an invoice. Please kindly indicate your order number.

Sure! Please send your forwarder information to hello@khadas.com, and include your Order-ID.

Please email us at hello@khadas.com to arrange an appointment before-hand. Our company’s address is D#2101A, Caifugang Building, Baoyuan Road, Xixiang Street, Bao'an District, Shenzhen, China 518102. (Baidu Maps: 深圳市宝安区西乡街道宝源路财富港大厦D#2101A(邮编518102))

Please email hello@khadas.com to schedule a meeting with us, and we will provide you with our local contact details, as well as assign a person to bring you around Shenzhen.

Opening Hours (Monday to Saturday):​ 9AM to 6PM (GMT +8, Beijing Time)

‘Tea’ was created to satisfy a high demand from our community for a “portable Tone2 Pro”; many music streaming apps such as Spotify and Apple Music now have high-quality lossless music that can only be fully enjoyed when you connect a portable DAC such as the ‘Tea’ to your Android or iOS smartphone.

For the electronics it's certified with CE, FCC, KC, TELEC SRRC, RoHS and UN38.3 (battery). With regards to audio, It complys with Apple MFi, MQA, Sony LDAC and Qualcomm aptX HD.

‘Tea’ has an inbuilt 1160mAh lithium-polymer battery for 8 hours of continuous music playback.

‘Tea’ contains two types of firmware:

1. Bluetooth Firmware: upgrade wirelessly with the ‘Tea’ app

2. USB Audio Firmware: upgrade with a USB-C cable and a PC

No. ‘Tea’ is designed to output audio to 3.5mm single-end headphones only, via the inbuilt 3.5mm single-ended headphone jack.

No, the Tea does not support wireless headphones, only wired ones via the 3.5mm headphone jack. Thus it will not be able to output an LDAC wireless signal to your wireless headphones.

We will release the “Tone2”, which is a bare board version for VIM SBCs. Tone2 Pro will only be sold as a finished product due to the MQA license restrictions.

Tone2 Pro is a finished product, that has an MQA license and will be sold with an aluminum case. Tone2 will be a bare board suitable for docking with VIM SBCs.

Yes, Tone2 Pro can be powered by most Android smartphones over USB-C. iPhone users will need an external 5V power bank connected to the secondary USB-C port labelled I2S, as the iPhone has insufficient power to drive the Tone2 Pro.

Yes the Tone2 Pro is a DAC + Headphone AMP.

Tone2 Pro is equipped with USB 2.0; both USB 3.0 and 3.1 are compatible with USB 2.0.

Tone2 Pro only supports I2S via the USB-C port. If your sound card has HDMI-I2S output, you will need to customize a home-made cable to transfer the audio from a HDMI connector to a USB-C (male) connector.

Tone2 will follow the Tone2 Pro form factor and support bottom-to-bottom mounting for VIM3/3L SBCs.

Visit Khadas Forum for futher information: "Tone2 Pro: Pre-Orders Begin 16th December @ $169.90! - #116 by wanthalf - Announcements - Khadas Community"

Yes, to enable ASIO support you have to install the Khadas Tone Driver V4.8x, download it from this link: https://dl.khadas.com/products/tone2/driver/tone_driver_latest.zip

Yes you should download our Tone2 Pro driver from https://dl.khadas.com/products/tone2/driver/tone_driver_latest.zip.

Yes, a normal USB-C adapter can work and the 4.4m JACK is wired per standard specifications. Tone2 Pro has 7 connectors:

* USB Port: it can connect to a PC/phone/tablet PC and so on. * I2S Port: it can supply audio from our Bluetooth module, or 5V power input from a linear power supply. * Orange balanced RCA: it can be used for coaxial input and coaxial output. * White balanced RCA: the left balanced signal or left unbalanced signal output. * Red balanced RCA: the right balanced signal or right unbalanced signal output. * 4.4mm headphone Jack: connect to your 4.4mm headphone. * 3.5mm headphone Jack: connect to your 3.5mm headphone.

The Tone2 Pro is designed to drive low impedance headphones with a maximum of:

* 150ohm for the 3.5mm single-end jack * 300ohm for 4.4mm balanced pentaconn jack

To drive 600ohm headphones, we will suggest that you connect an independent headphone amplifier to the RCA line-outs for more powerful and distortion-free sound.

Yes, Tone 2 Pro can be connected to any kind of amplifier via the balanced RCA line-outs. A tube amplifier is just another kind of power amplifier.

There are three kinds of audio source inputs:

* USB 2.0 Input,“USB” marked * Coaxial(SPDIF) Input, “Coax” marked * Bluetooth Input，“I2S ”marked，which you need to buy a Bluetooth module to plug into.

I think coaxial input may be the best option for your projector. In most cases, the projector will accept HDMI input from a PC, and you can connect your PC directly to your Tone2 Pro over USB.

Yes it works!

1. USB-C to Lightning, 100mm length, 2.1mm cable diameter 2. USB-C to C, 100mm length, 2.1mm cable diameter

Most visitors from overseas will arrive at Shenzhen Bao’An International Airport (深圳宝安机场). You can request for our staff to pick you up by car from the second-floor Departure Hall, Gate 4 to 8; ask the airport staff for instructions on how to go from the Arrival Hall to the second-floor Departure Hall.

There are only 2 hotels near our office that are able to accept foreign guests (automatic local police registration, acceptance of foreign credit/debit cards).

5-Minute Walking Distance:

Avante Garde Hotel (前岸国际酒店), which is a 5-star accommodation. ~580 RMB/night.

Wandu Traders Hotel (万都酒店), which is a 4-star accommodation. ~360 RMB/night.

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If you’re staying with a local friend or relative, it is required by Shenzhen law to register your residential address with the local police precinct within 24 hours after your arrival. Ask our staff for instructions on how to do so using WeChat. If you’re staying at the hotels mentioned above, they would perform this service for you automatically.

Unfortunately, not all local ATM Machines are compatible with your overseas VISA or Mastercard. The only machines known to be compatible are the ABC Bank ATMs situated directly outside Times Square Mall (时代城). You may also use Bank of China ATMs wherever you see them. Please be wary of your surroundings at all times when withdrawing cash, and avoid doing so late at night.

There is a large selection of tasty and affordable Chinese cuisine available around our office. Avoid eating too much deep-fried food, as the oil they use isn’t up to foreign-standards.

Times Square Mall (时代城) next to Pingzhou (坪洲, Line-1) metro station offers a narrow range of Western choices, e.g. McDonalds. For more options, go to Rainbow Mall (天虹) next to Xixiang (西乡, Line-1) metro station or Yi Fang Cheng (壹方城) next to Baoti (宝体, Line-1). Both are accessible from Pingzhou (坪洲, Line-1) metro station which is a 7-minute walk from our office.

For Muslim guests, you may ask our staff to recommend local Xinjiang (新疆) restaurants that offer affordable and tasty Halal meals; noodles, soups, burgers, stir-fry vegetables.

There’s a fairly large Walmart located next to Baoti Metro Station (宝体, Line-1). Or if you’re interested in seeing where the locals shop, check out “Ren Ren Le” (人人乐) supermarket which is adjacent to Times Square Mall (时代城), only a 2-minute walk from our office.

Download the WeChat app from the Apple or Android App Store. Sign-up for a new account with your telephone or email address, and add your VISA or Mastercard. You can give cash to our staff and they can send you the corresponding amount via WeChat for you to spend later. Scan a shop’s QR Code to send them RMB, or reveal your QR Code to the shop so they may deduct RMB.

China's Internet is separate from the Global Internet. In addition to using a different set of DNS servers, the Great Firewall (GFW) restricts access to foreign content, media and communications platforms.

WhatsApp, Telegram, Line, Facebook, Messenger, Slack, Discord, Gmail, Yahoo, and YouTube will be unavailable. It will be wise for you and the parties you are corresponding with to open WeChat accounts before you enter China, so that you may maintain communication with them without needing a VPN.

WeChat supports text, audio, picture, video, voice call and video call functionality, so you’ll definitely be able to keep in contact.

Before entering China, install a VPN on your smartphone and laptop: We recommend installing at least 2 different services, for example ExpressVPN (paid) and Betternet (free). The Great Firewall (GFW) uses Deep Packet Inspection (DPI), and VPNs will either be cut-off after sometime, or be very unstable with low packet transmission rates.

Having 2 different services on your devices will enable you to switch when one service becomes temporarily unavailable. The Tor-Onion-Protocol does work in China, provided you use a suitable Bridge-Relay, however it is much slower than a traditional VPN. Our office also uses a professionally managed VPN service, it may however be unstable at times.

Please contact hello@khadas.com, she will help you modify or cancel your current order.

This is not an issue if your order has not been dispatched yet. Please contact us as soon as possible so that we can add the items to your order. You will however, need to pay the difference in cost, before we dispatch.

You can return or exchange your purchase from up to 30 days since the purchase date. However, you’ll need to bear the shipping fee both ways. Returned / exchanged products must be in the condition you received them and in the original packaging.

Contact our tech-support at forum.khadas.com. If the problem is caused by a product defect, we would definitely replace or refund you. For any after-sales issues, kindly contact hello@khadas.com and provide your Order-ID.

Due to the success of the Tone2 Pro, our sales team has noticed unauthorized distributors and fake listings popping up on smaller, less regulated online sales platforms.

Please avoid buying from unauthorized sellers as there is no guarantee that an actual product will ship to your home.

In addition, we can only provide after-sales support and warranty to products purchased through official sales channels and authorised distributors.

Please refer to the "Our Partners" section found on https://khadas.com/shop, for authorized sales channels and distributors.

Tone2 Pro will sell as a finished product only. Khadas will launch the Tone2 (non-Pro) as a DIY Kit in the future, without MQA support.

You can be sure that Tone2 will be open source like the Tone1.

Yes, full MQA decoding for both the MQA Core and MQA Renderer.

Yes the Tone2 Pro is still a full-featured USB DAC, with the addition of a headphone amplifier.

The primary USB-C supports both power and data from your PC, Laptop, Tablet or Smartphone. The secondary USB-C is for connecting 5V linear power supplies that will bypass the primary USB-C power.

The Tone2 Pro supports full MQA decoding. To support MQA, the music player also needs to support playback of MQA files and streams.

You can download the Khadas USB Driver from this link：https://dl.khadas.com/products/tone2/driver/tone_driver_latest.zip. MQA can be used immediately and does not require activation.

Yes, the Tone2 Pro can be powered by most Android phones and iPad Pro devices directly via a USB-C (male-to-male) cable. If the phone or tablet cannot supply enough power, you can power the Tone2 Pro with a powerbank connected to the USB-C (I2S) port.

The ESS ES9038Q2M DAC does not support MQA decoding. In the case of Tone2 Pro, the XMOS processor XU216 does the MQA decoding. The I2S input on the USB-C port, GPIO pins, and the SPDIF-IN are routed to the ESS DAC directly, and not through the XMOS processor; therefore these inputs do not have MQA decoding support.

Tone2 Pro supports both Coaxial and USB inputs, and you can set the preferred input manually or leave it in automatic mode. When set to AUTO, the coaxial input has higher priority over USB input.

Tone2 Pro's default firmware only has hardware volume control.

We will release dedicated firmware with dual volume support in the near future, you can upgrade your Tone2 Pro's firmware to enable software volume.

Yes you can use the Tone2 Pro with devices that do not have a USB-C port, however do note that the experience remains rather clunky. If you must, refer to this forum post for the converter cables you'll need to buy: https://forum.khadas.com/t/tone-2-with-ipad-and-iphone-solved/11683/6

Yes, of course. The ‘Tea’ app does however provide additional audio customisation features such as gain control, audio filters, as well as firmware updates over Bluetooth.

No, it is not waterproof. Please do not use it whilst swimming.

• Single Board Computers (e.g. VIM, Edge, Tone Board): 12 months

• Accessories (e.g. USB-C Cable, Cooling Fan): 6 months

• You need to pay for the shipping cost from your country to our office.

• Khadas will pay for the shipping cost from China back to your country.

• The return requester needs to pay for the shipping cost both ways.

• The products may not be fixed if the damage is serious (i.e., CPU/PMIC/PCB is broken permanently)

• There might be additional service charges if the hardware needs any rework / repair processes.

Yes we do, just provide a valid shipping address and working handphone number for the courier.

Pre-orders will begin on 16th December.

Yes we do, just provide a valid shipping address and working handphone number for the courier.

Pre-orders will begin on the 11th of January on Indiegogo.

Contact us via Khadas Forum, or hello@khadas.com, to notify us about your issue first. Be sure to include the following details:

Email Subject:

"Repair: [Fault Description] (Purchasing Channel, Order-ID)"

Email Contents:

1. Description of your problem, and steps to reproduce it.

2. Photographs.

3. Videos (optional, to reproduce problem).

4. Purchase Channel (e.g. Khadas Shop, Gearbest, Amazon, local distributor, etc).

5. Order-ID.

Certain problems may be resolved locally, without incurring the cost and time of return shipment. In some cases, we may also send you a replacement, without the need for a product return.

You may need to return products and accessories to Khadas in the event that you want an exchange / refund. Or when your product is damaged and requires repairs that you are unable to perform.

Don't return-ship your product as a parcel nor a package. Instead, choose to go to your local Post Office and send it back via post. Postal services may take up to 30 days to return-ship. If you are in a hurry, you may have to use more expensive express services.

1. Go to your local Post Office.

2. Mark value as: "$5 USD".

3. Choose type: "Gift".

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4. Shipping Address:

Address: Room 2701, Floor 27, Qiancheng Center, Haicheng Road, Bao'an District, Shenzhen, China 518101

City: Shenzhen

Province: Guangdong

Country: China

Postal code: 518102

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5. Shipping Recipient:

Attention: Willow

Mobile: +86-18038034175

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6. If possible, please add this Chinese address to the outside of your package to speed up delivery.

Address: 深圳市宝安区海城路前城中心27楼2701室 (邮编518101)

Contact: 李春柳 +86-18038034175.

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7. Add a note to the outside of your package (include Purchasing Channel, Order-ID):

"Repair: [Fault Description] (Purchase Channel, Order-ID)".

You may also email us at: khadas.wesion@gmail.com.