Or so they claim. The build looks tidy.
https://www.ebay.com/itm/Finished-Beyerdynamic-HIFI-Stereo-Headphone-Amplifier-with-USB-card/192278135564?_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=44040&meid=5cdb9a2d958e4bef90066d7327b9bb52&pid=100005&rk=5&rkt=6&mehot=pp&sd=172106967402&_trksid=p2047675.c100005.m1851
https://www.ebay.com/itm/Finished-Beyerdynamic-HIFI-Stereo-Headphone-Amplifier-with-USB-card/192278135564?_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=44040&meid=5cdb9a2d958e4bef90066d7327b9bb52&pid=100005&rk=5&rkt=6&mehot=pp&sd=172106967402&_trksid=p2047675.c100005.m1851