Product Name:Digital to Analog Audio Converter Adapter Product material:ABS&Metal Product color: black Product size: 6.5cmx4.1cmx2.5cm Product weight:95g Package Contents: 1 x Digital to Analog Audio Converter Adapter 1 x USB Power Cable 1 x 0.5m fiber 1x English manual Features: 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 audio Supports sampling rate at 32, 44.1, 48 and 96 KHz. 4.24-bit S/PDIF incoming bit stream on left and right channels Provides 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