OdiySurveil (TM) HD CVI/TVI/AHD Coaxial Video Ground Loop Isolator built-in Surge Protection Video Balun Material : Alloy & ABS Plastic with pure copper BNC connectors nickel plated,Product name:HD-CVI/TVI/AHD Coaxial Video Ground Loop Isolator; Compatible with CVI 1080P,TVI 1080P,AHD 720P,AHD 1080P,Dimensions:52*26*22mm with 18cm*2mm cable; Omall Brand product with the best quality and more efficient signal transmission,do not compare with those junk materials.BNC male to BNC female with mini cable 18cm on both sides; Prevents video-signal distortion caused by video ground loops,Eliminates picture teasing,cross talk and rolling,Prevent power cables laid by others interfering with the CCTV system; Built-in Video filter,perfect to work with DVR to immunity DVR interference,for extra interference rejection;