... Proof, Dual Power Input RS485 Data, 3l lighting proof Video Optical Transceiver1CH Video, RS485 Data 3 Levels Lightning Proof, Dual Power ... Input 1CH Basic Model Support Max. 1CH Video, 1CH Backward or Bi-directional Semiduplex RS485 Data , 2CH ... Value, 3 Levels Lightning Proof, Dual Power Input, Power Connection Protect. Serveral units combinable in a big cabinet. Aluminium case ...