1. Support one Optical input,one Coaxial input,Bluethooth 5.0 input,one USB 2.0 input,One PC-USB input. You can switch different signal sources randomy by Button Or Remote Control     2. Audio farmat support FLAC,APE,DTS,AC3,WAV,HDCD,DSD,AAC,WMV,MP3,M4A etc.     3. Support 5.1ch/2.1ch/2.0ch output mode selection,FL/FR active when 2.0ch output mode.     4.Support volume adjustment and switch between previous song and next song     5. Support Button Or Remote Control switch input source ,and turn on corresponding LED.     Surpport hardware decoding (5.1 channel separation ) and software decoding(2.0ch to 5.1ch)     Support USB player and Input source selection power off memory function.     The use of DC-5V/1A external power adapter power supply.     Support remote control to adjust front/surround/treble/bass group adjustment.     Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on./EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on.     Colour:black     Material:Aluminum alloy          Package Contents:     1 x Audio Decoder     1 x Remote Control     1 x Power Adapter     1 x Fiber optic cable     1 x Audio Line          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.