Littelfuse ATD200BP ATD Anti-Theft Battery Master Switch Features a special disconnect that allows the battery to be easily be removed for anti-theft protection perfect for seasonal storage needs or easy off vehicle battery charging for autos, motorcycles, RV's and boats A simple turn of the knob isolates the battery and renders the vehicle unstartable Fits all top mount post batteries Works on 12 to 24 volt systems up to 135 amperes