1: The battery isolator switch is made of metal alloy and copper material, which is sturdy, solid, high strength and wear resistant, and good isolation capacity with long lifespan. 2Prevent Leakage: Battery Disconnect Switch provides power cut off to electrical system in an emergency, to help prevent battery drain, safety and efficient. 3Safety Protection: Quick cut off electrical power, help protect against electrical fires, provide a reliable way to shutdown electrical power during maintenance and protect batteries from excessive drain. 4Widely Application: Safety battery disconnects switch universal applied for street roads, rvs, trailers, or any vehicle where a battery cut off switch is required. 5Easy Operation: Knob detachable and with spring, this car battery disconnect switch can be controlled by switching to counterclockwise position. Protect the power supply and prevent leakage.