1. Support WIFI Stream Media input,Bluetooth 5.0 input,Coaxial input,one Optical input,PC-USB input,AUX input,USB 2.0 input. You can switch different signal sources randomy via Button or Remote.  2.Support Optical output,Coxial output,5.1ch analog audio output , all audio output simultaneously.  3. All signal source(WIFI/Bluetooth/COXIAL/OPTICAL/PC-USB/USB/AUX) can decode to 5.1ch output,it is audio decoder system.  4.Support Qualcomm Bluetooth 5.0 audio receiver.Bluetooth chip: QCC3034, Bluetooth protocol: AptX-HD/Aptx-LL/Aptx/AAC/SBC, Bluetooth sampling: 44.1khz/48khz 16bit/24bit  5. Op amp chip: TI NE5532 * 3, users can replace and upgrade by themselves(DIP8 female seat)  6.External Bluetooth antenna:20 meters long distance transmission(in the open without interference)  7.Supported audio farmat :DTS HD,DTS,DTS-ES,Dolby Atmos, AC3,WAV,FLAC,APE,HDCD,AAC, WMV,MP3,M4A etc.  8.Support 5.1ch/2.1ch/2.0ch output mode,FL/FR active when 2.0ch output mode.  9.Support Button or IR remote switch input source and adjust.  10.Users can upgrade firmware when manufacturers have updated.  Plug Type: US Plug,it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on.  Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on.  Colour:black  Material:Metal  Size:249 x 85 x 35mm    Package Contents:  1 * WD850D 5.1CH Audio Decoder  1 * power plug    Only the above package content, other products are not included.  Note: Light shooting 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.