[1] Tone2 is sold in two versions, a finished product with an enclosure, and a bare PCBA 'Maker Kit'.

[2] iPhone support requires the USB-C to Lightning OTG (Apple C78-USBH) cable, normal Lightning charging cables will not work.

[3] Coaxial S/PDIF out requires use of a specialised firmware, and a Balanced RCA to Standard RCA converter cable.