1:long range video transmitter receiver 2:two levels of lighnting 3:1/4/8/16channels 4:300/600/1500 ... capability, transmission distance: 300metres, 600metres, and 2500metres. support all of the video format, include PAL, NTSC, SECAM, compatible with post ... , real time transmission if no delay, multi-channel are aluminum alloy shell, multi integrated circuit transmission, small volume, ...