Video Balun, Ground Loop Isolator, Coax BNC male to BNC female, Passive type, no power needed. Transmits a full motion monochrome video signal up to 1, 900 ft., color video signal up to 980 ft. Built-in TVS (Transient Voltage Suppressors) for surge protection. Prevents CCTV system interference caused by conflicting power cables. Eliminates picture tearing, cross talk and rolling.