... time transmission if no delay, multi-channel are aluminum alloy shell, multi integrated circuit transmission, small volume, ... 300A1600A1,5001B,600A4,600A8,600A16Transmission signals:1 channel, 4 channel, 8 channel, 16 channelPower supplyPassive, DC12V, AC220VTransmission ... air discharge 3 classifyShell:ABS (one channel) aluminum alloy (multi-channel)Color:Red,whiteUnshielded twisted pair transmission ...