Arming and disarming the alarm can be rather easy. Often, it involves the keys, and the driver can manually shut off the alarm by placing their key in the door. They may also be able to disengage the alarm from a button, usually attachable to the keys. There is also sometimes a button hidden inside the car to override the alarm.
How the alarm is triggered depends on the make and model of your vehicle. There are also many after market alarms, which can be purchased and installed after buying your car. These can be set off from opening the doors or trunk, and also when the hood is opened, or the ignition is turned on. They can also be triggered by an impact to the car, or a difference in voltage in the car, though the latter has become less useful, as car technology is starting to incorporate more electronics into vehicles.
Sirens and alarms, however, are not entirely effective. Some people might be able to get away with the car before you can get to it. Also, due to the number of alarms set off by accident in the past, people in urban areas are generally not prone to respond to a car alarm.
Car immobilizers are devices that prevent an unauthorized person in your car from driving away with it. It can prevent hotwiring, because the car will only start when the correct key is inserted. This is because the key contains a miniature circuit, and that will connect the electricity in the car.
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