... interface,and is convenient for installment with mini volume;2,Transmit 4 channels video or 3 channels video +1channel negative RS485 control signal ... can be driven by special chip with 15Kv anti-static module ,which can be 64 nodes;4, under HS frequency reuse way, ... signals are combined with high speed without any delay and disturbances;5,adjustable knob is installed in receiver,which can fine ...