This digital tilt sensor is designed to work with most aftermarket and OEM alarm systems, to help detect when a vehicle is being raised in an attempt to either remove the vehicles wheels or to tow the vehicle. This tilt / motion sensor has a 1 to 3 degree tilt sensitivity, and will reset the vehicle's initial angles of vertical and horizontal inclination each time the vehicle is parked. This ensures the most accurate tilt and motion sensing possible. This unit is used to compliment the level of security provided by the shock sensors found on most aftermarket alarm systems. Comes with installation instructions.