Two common types of car alarms are passive and active choices. The passive system is set automatically every time the key comes out of the ignition and all the doors are closed. The active system requires the driver to physically turn it on when passengers have left the vehicle. Passive systems are more securely sound in that the driver does not always have to remember to turn it on every time they leave the car. However, active systems are useful in that if the driver forgets something inside the car, they do not have to deal with the security system going off when they try to get back inside the vehicle.
Engine immobilizers, which are electronic security devices that are placed inside an automobile engine, prevent the whole machine from being hot-wired and stolen. These devices work by keeping the engine from starting unless the key is present. This prevents criminals from being able to manipulate the wires of automobiles and hinders theft.
Another common system is the audible alert, which blasts the horn and flashes the automobile’s