BNC Passive Male to Female CCTV Camera Video Ground Loop Isolator Prevent Distortion ,No Power Required Passive, no power required, 15cm long on both side Prevents video-signal distortion caused by video ground loops Eliminates picture tearing, cross talk and rolling Prevents power cables laid by others interfering with the CCTV system Built in Video Balun, perfect to work with DVR to immunity DVR interference, for extra interference rejection