It is used for power and video line's lightning protection of the fore-end High Speed Sphere Camera, Middle Speed Sphere Camera, Pan/Tilt Camera of security system.Widely used for warehouse, residence community, road monitoring system.Provide surge protection to video, power, control signals of monitoring cameras and cable televisions.Easy to install. Install near security camera first, "IN" end is for input and "OUT" end is for output to security camera, then set ground wire well and straight.Protects video and power ports of your security camera from the damage of lightning and surge.