that a solid company, a low-cost DAC builds, offering ... of course, only to the TV to be connected Hifi system. The power supply is from my TV (LG 42 inch) via USB, there is also a USB plug in. The supplied power / USB cable could be longer (about 40 cm long). Cable for connection are of course required (analog chinch to the amplifier, as digital cable is a coax digital cable or a Toslink Kabal Also Known required as optical cable. The latter is more needed, since most TV a Optical Out haben..LG, Samsung, Sony. .. just older Philips TV and discount brands have a coaxial output). Sound: good and I'm Hifi fan, as connoisseurs, no hardening in Ton..also everything Ok, well, all I need to see not TV (my Denon PMA 2000 AE. Hum devices do not exist, today, I took a short switch-was only the amplifier was turned on, then supplies the TV, which then has the converter via USB with power and there was a little noise ... so only a TV, then amp ;-). All in all, I'm excited and I hope that it stays that way!, Have the converter only for a few days.