VIMVIP HD CCTV Via Twisted Video Balun Transmitter Transceiver for CVI/TVI/AHD CCTV System Pack of 4 Pairs 8 Pieces Casing Material : Alloy & ABS Plastic;Product Name :HD-CVI/TVI/AHD Video Balun; Compatible with all HD-CVI, HD-TVI, HD-AHD; Frequency response: DC to 60Mhz,Attenuation: 0.5dB type,CMRR: 60dB; Impedance: BNC: 75ohms,Terminal: 100ohms,Surge protection:4KV,ESD:8KV; Package include:1x VIMVIP AHD Video Balun.