... .5Km. Features :LCD display, as man-machine interface, LCD display board is more intuitionist, convenient, each to understand, plentiful information, etc ... , 500mACommunicationRS485ProtocolPelco-D, Pelco-P, Pelco-D1, Pelco-P1, NewBaud Rate1200, 2400, 4800, 9600, 19200Communication Distance1500m (4900ft) with twisted-pairMax controllable Cameras128 ...