Product Name:Digital to Analog Audio Converter AdapterProduct material:ABS&MetalProduct color: blackProduct size: 6.5cmx4.1cmx2.5cmProduct weight:95gPackage Contents:1 x Digital to Analog Audio Converter Adapter1 x USB Power Cable1 x 0.5m fiber1x English manualFeatures: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 perform 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 stream 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 someBad 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