1.This Digital to Analog Audio Converter is designed for either home or professional audio switching.2.This Converter has many features that enable it to in a superior manner.3.Converts Coaxial or Toslink digital audio signals to analog L/R audioSupports sampling rate at 32, 44.1, 48 and 96 KHz.4.24-bit S/PDIF incoming bit on left and right channelsProvides electromagnetic-noise-free transmission.Easy to install and simple to operate.The Reason of cancel the external power adapter and use USB powered.5.Many devices (e.g. Computer TV DVD) USB ports output stable voltage and current, And filters some Bad waves. So the DAC( Digital to Analog audio converter) will works better, And decode will more stable. In addition ,Use USB output power that is more environmentally friendly