... with lightning-proof and anti-jamming. NA-300A-1: passive Twisted-Pair Video Transmission, control distance 300metres, lightning protection, ... NA-600A-1: passive Twisted-Pair Video Transmission, control distance 600metres, lightning protection.NA ... .8Gross Weight0.06kg/pair0.06kg/pair0.4kg BNC Passive/active Twisted Pair/ cctv video balun