Hifime S2 DAC - USB and Optical DAC for iPhones, Android, USB-C

The Hifime S2 both a USB and SPDIF DAC with Sabre ES9038Q2M. Cables available for Lightning (iPhone), USB-C, microUSB, USB-A and more.

USB to Optical/Spdif Audio Science Review (ASR) Forum

Hifime UDA38Pro DAC (ES9038Pro)

Hifime Sabre 9018 USB DAC - Reviews

Hifime Sabre 9018 USB DAC - Reviews

The Best Portable DAC Dongles For Android - Major HiFi

FiiO Q5s -Flagship Bluetooth DAC & AMP, Dual AK4493 DAC chips

HiFime

HiFimeDIY Tiny USB DAC - Hifime Audio

rooPlay - From LP, CD and iPhone to Roon - rooExtend - Roon Labs

FiiO Q5s -Flagship Bluetooth DAC & AMP, Dual AK4493 DAC chips