Protect BatteryThis battery shut off switch is designed to cut-off power flowing to the battery, avoid unwanted battery consumption when not used for long periods of time, extend the life of battery. Widely ApplicationsBattery disconnect switch enables you to quickly and easily disconnect your automobile battery for safety,servicing,or storage.Applicable to Auto, Boat, Truck, Motor Homes, etc., Mainly used to solve the problem of leakage and loss of electricity caused by batteries that are not used frequently in battery Car, Motorcycles and Auto. Rated current 100A, withstand current 400A, Connected to the Battery Negative Column 15-17mm. High StandardBrass Green battery switch made of heavy duty Brass alloy,Durable zinc alloy terminal.Heavy Duty,Suitable for most batteries, under the condition of 12V voltage, continuous current 125A, Must Have Battery Disconnect Switch: Battery disconnect switch protects everything from cars to boats to semis with this knob, handling 12V of up to 125A continuous & 500A momentary current. It is ideal for cars, boats, trucks, RVs vehicle and electrical equipment batteries. Easy Installation and Useloose is power off, tightening can be conductive.Battery operated switch to engage power just hand tighten the green knob,Slightly loosen the green knob to disconnect all power(power off only need to turn the switch (green) loose 2-3 laps on the whole vehicle power off, power on the switch properly tightened, you can start the vehicle)