The 509U Ultrasonic Sensor adds interior cabin protection by monitoring the airspace inside your vehicle. It detects movement and air disturbance inside the cabin, helping trigger the alarm if someone gains access to the vehicle interior, including entry attempts that may not involve breaking glass. It is most effective when doors, windows, and the sunroof are fully closed.

• Ultrasonic interior sensor that provides coverage of the vehicle cabin

• Detects movement inside the vehicle by sensing air disturbance and pressure changes

• Helps detect entry attempts without glass breakage

• Adds an extra layer of protection when used with compatible security systems

• Most effective when all entrances are secured and closed (doors, windows, sunroof)

• Not recommended for convertible vehicles