ddHifi’s TC35B is a beautifully crafted dongle DAC. It’s housing is made of 316 stainless steel and it’s possibly as small as a dongle DAC can get.
You can buy the TC35B from ddhifi’s official Aliexpress Store.
Here are it’s published specifications:
USB CODEC: ALC5686
Output Power: 30mW@32Ω
THD+N: <-92dB; DNR: >110dB; SNR: >120dB
Drive Ability: 16~200Ω
Frequency Response: 20Hz~20kHz
PCM Sampling Rate Supported Up to: 32bit/384kHz
Weight: 6g; Dimensions: 18.8*11.2*10.2mm (exclusive of Type-C plug)