1Main Function: When your Rv, boat or car is not in use, the battery switch prevents any current from being drawn from the battery and can disconnect the battery safely and extend its service life. 2High Safety: The battery disconnect switch provides additional safety by completely cutting off power to the vehicle's electrical system, can prevent accidental electrical fires, power surges, or any other electrical problems that may occur when the vehicle is not in use. 3Easy to Use: Designed to be easy to install and operate, the battery cut off switch can be installed within easy reach of the driver or in a convenient location to quickly and easily disconnect the battery. 4Durable Material: The battery power cut master switch is made of durable and reliable material, high strength and wear resistant, having long service time. 5Widely Used: The heavy duty battery cut off switch has wide application of marine, boat, Rv, vehicle, etc., can perfectly fit for your automobile and boat.