●  Wireless talkback and music control center.
●  Full screen design, 4ʺ IPS LCD with superior screen ratio.
●  Several music modes:  local music, net radio, SD card, USB, the third-party music APP, BLUETOOTH, streaming and AUX.
●  Support talkback and call for multiple DM839 or DM858.
●  Support RS485 control.
●  Support WIFI connection.   
●  Possess timing function.
●  Three scene playback mode and customized mode 
● selection: Party, Sleep, Relax, Customize.
●  Support doorbell linkage.