... , while placed on the vehicle, for mobile transmission, audio, video,and GPS data can be separate connect to the 3G DVS ... Emergency buttonBoard : WCDMA,CDMA 2000,TD-SCDMA 3G modules and GPS modules, plug and play with 3G SIM card, Relay Server will automatically connect ... ), support for real-time monitoring, control, playback, PTZ control and video.UHF Can be used separately, also can combine with 3G ...