Review on Fosi Audio K1 Bluetooth 5.0 DAC Headphone Amplifier Mini Stereo DAC Amp & Preamplifier 🔊 - 24-Bit/192 KHz USB/Optical/Coaxial to RCA AUX Digital-to-Analog Audio Converter Adapter for Enhanced Home Audio System by Richard Dean

When I saw the packaging I was afraid it would be bigger than I thought, but to my surprise the device was actually smaller than I expected. In my case, being very small is a big advantage as I often move it along with my laptop from my desk (to use a pair of satellite speakers for work) to my living room (to use bluetooth for listening to music). It comes with an AC adapter so I have to power it from my old 5V iPhone power bank (although the cable is included). Setting it up with a USB input was pretty easy, following the little Bluetooth pairing guide that came with it. The quality is quite good in both cases. I would include a power adapter to help those who don't have one handy otherwise a good product if you are looking for a portable DAC like me.