This operates good. but it's sound is medium qulaity.
This sound is high quality and premium sound better than any other sound card [sb x g6,sb x ae5 and internal realtek sound(alc1220) etc] in optical mode. this product's sound acurate ,loud and calm in musical and vocal. but Amp is high grade ( i am a Harman cardon AVR-165).
Received the item in an envelope with USB power cable. Works well. I am using it to extract the audio from my Chromecast 4k and forward it to my amplifier without having to power on my TV.