Need battery : CR Features: 1.This is a More Convenient Car Battery Disconnect Switch System that can remotely master kill your car power system,A Proper maintenance will extend and protect the battery and engine life 2.Remote operation,Comparing to tranditional battery switch, this Remote Control Wireless Battery Switch Disconnect allows you to move the trigger from under the hood to your hand so that you no need to frequently pick up the hood. 3.Come with One 300 Feet New Style Remote Control.You can even control it in your house,One button control on your dash for the whole car power system, Remote Receiver Standby Current is very low (0.003A),Universal for DC 12V Camper Trailer SUV Van Small Truck Agricultural Vehicle Trike Auto Off Road.(Battery Negative Column within 15-17mm) 4.Integrated design, small size, avoid cumbersome wiring, convenient installation Description Working voltage: 12V Working current: 200A Silver Contact Instantaneous current: 1000A Fitment Suitable for any 12V vehicle with displacement less than 4.0(Battery Negative Column within 15-17mm) Installation Steps 1.Remove the negative power line of the original vehicle 2.Fix the original vehicle negative power line to the unit 3.Fix the unit to the negative pole of the battery 4.Connect the red wire to the positive pole of battery black wire to the negative pole of battery Installation Warning: Do not connect the positive and negative poles in reverse, or the motherboard may be burned Package Included: 1 Pcs Car Battery Isolator 1 Pcs remote control