Batteries that are empty and not charged for a long time will shorten the life of the battery causing you to replace it sooner than necessary which can be expensive. This battery cutoff switch allows you to eliminate any power being drawn from the battery when the RV, Camper, Boat, Car or Truck isn't being used after coming home from a trip. This battery master power disconnect switch can be a stand alone or used together with other switches and is great for almost disconnect purposes you can think of for Marine, Automotive and Campers. It comes with rear cover to insulate terminals against any kind of circuit shorts.