... receiver 2:two levels of lighnting 3:1/4/8/16channels 4:300/600/1500/2500m 5:DC12V ... 5001B,600A4,600A8,600A16Transmission signals:1 channel, 4 channel, 8 channel, 16 channelPower supplyPassive, DC12V, AC220VTransmission distance:300- ... receiverNA600A16: 16 channels wireless 600m video transmitter receiverNA5004B: 4 channels 2500m video transmitter receiver(with power)NA5008B: 8 channels 2500m video ...