Compatible Spurtar battery disconnect switch is suitable for most top post terminal(15-17 mm cone battery negative post), use under the condition of 12V voltage, 125 A, knob type. Durable Brass battery quick disconnect switch made of heavy duty solid brass, waterproof, protect from rust and corrosion, durable made, safety use. Safety Battery Cut Off Switch is designed to cut-off power flowing to the battery to avoid unauthorized use of your vehicle or unwanted battery consumption when not used for long periods of time Application Car 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 to use Make sure the negative battery post and battery clamp (original battery connector) clean before install. To engage power by hand tighten the green knob and just slightly loosen the green knob to disconnect all power