1.MUST HAVE BATTERY DISCONNECT SWITCH: The battery disconnector protects everything from cars to boats to semi-trailers, with this button that can handle up to 125A 12V continuous current and 500A instantaneous current. It is ideal for batteries in cars, boats, trucks, motorhomes and electrical appliances.2.SAFETY PROTECTION: The battery disconnector 12v is designed to interrupt the current flow to the vehicle battery to avoid unauthorized use of your vehicle or unnecessary discharge of the battery when not in use, prevent the vehicle from discharging from the battery and reduce the risk of electric fire.3.Easy to operate: The battery disconnector switch is easy to operate. Simply tighten the green button by hand to turn on the power supply, and loosen the green button slightly to cut off the power supply. Make sure the negative battery pole and battery terminals (original battery terminals) are clean before installation.4.Wide Application: The battery disconnector is suitable for most top pole connectors (15-17mm conical battery minus). Please make sure this battery disconnector is used for use in motor vehicles with 12 V, 125 A, button type.5.Quality: The 12v battery disconnector switch is made of heavy duty solid brass, rust and corrosion resistant, which greatly protects the battery disconnector from rust and corrosion, durable and safe to use for a time