HDMI2.0compatible(x4)+ARC+Coaxial+Optical+PC-USB+AUX+USB 2.0+Bluetooth V5.0 input.     HDMI compatible+Coxial+Optical+5.1ch output     All signal source(HDMI compatible/ARC/COXIAL/OPTICAL/PC-USB/AUX/USB)can decode to 5.1ch output.     All signal source(HDMI compatible/ARC/COXIAL/OPTICAL/PC-USB/AUX/USB)can convert to COXIAL/OPTICAL output.     HDMI compatible resolution up to 4Kx2K@30hz,support 3D     Supported audio farmat :FLAC/APE/DTS/DTS-ES/DTS-HD/AC3/WAV/HDCD/AAC/WMV/MP3/M4A etc.     Support 5.1/5.0/4.1/4.0/2.1/2.0ch output mode,FL/FR active when 2.0ch     Support Button switch input source, U disk play up and down ,play / Pause,turn on corresponding LED or display on LCD.     Support IRremote control operation.     U disk supports folder and file browsing and playing, displaying song title. Support optical and coaxial output.The capacity is 128G/FAT32 format.     The power-off memory function, automatically switch to the last used signal channel, USB broadcast memory before the power-off.     Surpport hardware decoding (5.1 channel separation ) and software decoding(2.0chto 5.1ch)     PS: ARC need to use 19+1 core HDMI cable+TV support ARC function     Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. / Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on     Colour: black     Material: metal     Size: 184 x 97 x 53mm          Package Contents:     1 x HD920PRO 5.1CH Audio Decoder set     Only the above package content, other products are not included.     Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.