An alarm system is an electronic security device installed in a vehicle. It will trigger the horn or a high volume sound, together with flashing lights when an intrusion is detected. There are two main types of alarm system, namely passive and active. Passive alarms are armed automatically when the car doors are closed. Active alarms, on the other hand, will only be armed or disarmed when the transmitter button on the remote is activated. Car alarm manufacturers have designed advance alarm system, such as the 2-way alarm system, which will deliver a message to you when someone is attempting to break into your car. You may even turn off the ignition system or cut off the fuel injection with the remote.