... network video server 1.International patent, the smallest pack in the world 2.the stand-alone relay server 3G 4 channel H.264 ... alarm in and outVideo input : 4 channel CVBS(PAL/NTSC),BNC interface, adjustAudio input: 1 channel Audeo input(mono)Video Compression bit rate ... Sensor in ,1channel alarm out,( on , off, earthing)PTZ serial : 1 channel RS485, support Pan/Tilt/ Zoom( Pelco-D,Pelco-P)Front ...