... , reduce your cost2: factory price, have 10 years experience, specialize in producing Video balun3: Delivery Time: 1 week after payment confirmed4 ... PAL, NTSC, SECAM, compatible with post, real time transmission if no delay, multi-channel are aluminum alloy shell, multi integrated circuit ... power)NA5008B: 8 channels 2500m video transmitter receiver(with power) in stock passive video transmitter