... payment confirmed4: Warranty: 2 years guarantee from purchasingDescription of CCTV Video Balun/ Twisted Pair wirless long range ... transmission distance: 300metres, 600metres, and 2500metres. support all of the video format, include PAL, NTSC, SECAM, compatible ... interface protection:2KVTwisted pair transmission interface protection:2KV(Differential mode), 4KV(Common mode)Average time between failures ...