Omall (TM) 1Pair HD-AHD/CVI/TVI Passive Video Audio Power Balun Transmitter Transceiver,With Surge Protection Casing Material : ABS Plastic with pure copper BNC connectors; Product Name :HD-CVI/TVI/AHD Video/Audio/Power Balun; Brand product with the best quality and more efficient signal transmission,do not compare with those junk materials.Compatible with all HD-CVI, HD-TVI, HD-AHD; To send HD-CVI,HD-TVI,AHD camera 720P up to 300 meters over UTP Cable; Built-in transient suppression protection,Surge Protection; Working Temperature: -10C to +70C,Storage Temperature: -30C to + 70C.