To further enhance the security system you can choose an optional Dual Zone Microwave Sensor which detects movement separately in two zones or an ultra sonic Proximity Sensor which detects movement using ultra sound waves inside the vehicle.

The microwave sensor will allow you to set 2 proximity zones for your vehicle. If for example you have a convertible car the first zone would be 1m (can be set) around the outside of the vehicle and the second would be inside the vehicle. If the first zone is breached, lights can flash and an audible warning can sound asking them to step back. If the second zone is breached the system can go into full alarm mode. There are many other alarm responses that can by programmed to suit your needs.