PROTECT THOSE RIMS! Stellars Electronic Tilt Sensor is a great added security to any alarm. Prevents theft of your expensive rims and unwanted towing. Features electronic tilt memory technology that remembers your vehicles parking angle when the ignition is turned off. This enables you to park your vehicle on steep hills with no problems. Many tilt sensors use a mercury switch that prevents parking on any incline. The TL1000s universal design allow it to work with any alarm system, including Stellar alarms. Plug in harness and detailed instructions make installation a snap!