1: DAC651C: supports one ARC input, one optical input, one coaxial input, one Bluetooth 5. 0 input, and one USB 2.0 input. You can randomly switch different input sources through buttons. 2: Supports one 5.1-channel analog audio output. Output through three 3.5mm phone connectors. 3: Audio formats support DTS, DTS-ES, DTS-WAV, AC3, FLACAPE, AAC, WMV, MP3, M4A, etc. 4: Supports Bluetooth V5.0 receiver, supports SBC/AAC (Apple) supports 15 meters distance. 5: PC-USB sound card supports WinXP/Win7/Win8/Vista/Win10, etc. 6: DAC651C supports HDMI-ARC. 7: Supports 5.1ch/2.0ch output mode selection, FL/FR is valid in 2.0ch output mode. 8: Supports volume adjustment by button. 9: Support DTS/AC3 hardware decoding (5.1 channel separation) and PCM software decoding (2.0ch to virtual 5.1ch) 10: Support USB player and input source selection shutdown memory function Specifications Supported formats:DTS, DTS-ES, DTS-WAV, AC3, FLAC APE, AAC, WMV, MP3, M4A, etc. DSP sampling frequency range:24~192 KHz DSP bit rate range:16-24 Bit Digital input level:0.1-2Volts p-p Analog output level (1kHz@0dB):Greater than 2VRMS THD+N:90dB Dynamic range:105dB Frequency response:20Hz~20KHz Bluetooth working distanc:15m Maximum working current:400mA Power adapter input:AC100V-240V 50HZ/60HZ,DC-5V/1A Operating temperature range:-10 to +60°C Storage temperature range:-20 to +60°C Operating humidity range:10 to 90%RH (non-condensing) Storage humidity range:5 to 95%RH (non-condensing) Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC 220V Colour:As shown Material:plastic Package Contents: 1 x 5.1 Audio Decoder set