... alone relay server 3G 4 channel H.264 DVS network video serveris the unique wireless high-definition video transmission ... .connector (Optional Accessories)UHF wireless digital transmission equipment, can link 3G D1 HD video servers, particularly suitable for blind spots ... RS485, support Pan/Tilt/ Zoom( Pelco-D,Pelco-P)Front panel : LED, Keyboard, record, network, Emergency buttonBoard : WCDMA,CDMA 2000, ...