Omall (TM) 2PCS HD CCTV Passive Twisted Video Balun Transmitter Transceiver for HD-CVI/TVI/AHD System Casing Material : ABS Plastic;Product Name :HD-CVI/TVI/AHD Video Balun; 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,with Surge Protection; Frequency response: DC to 60Mhz,Attenuation: 0.5dB type,CMRR: 60dB; Impedance: BNC: 75ohms,Terminal: 100ohms,Surge protection:4KV,ESD:8KV; Working Temperature: -10C to +70C,Storage Temperature: -30C to + 70C,Dimension:39mm*17mm*19mm(excluding connectors).