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Alarm Systems
More popular with car alarms, contact alarm systems have many different types. Here are some of them:

Door Sensors
How else can a car thief get inside your car but through the door? This is the logic behind door sensors, which are activated once the door moves. A small switch strategically placed on the most inaccessible area of the car so that more experienced criminals will have a hard time disabling it, activates the alarm and alerts the sound box. This is the most popular of all car alarms as almost all cars have one installed. Door sensors are also used in home alarm systems but since there are many entry points in a house and most robbers do not go through the doors, a more comprehensive type is more suitable.

Window Sensors
Some car stereo systems are stolen with the thief merely maneuvering in the small space of the smashed window. To avoid this, window sensors use small microphones to verify if a window is deliberately shattered. Window censors are often installed with a car audio system. A tiny microphone gathers the sound of smashed glass, which is a very distinctive in itself, and transmits it to the alarm sound system. This scheme makes the method very reliable because the microphone almost never fails in performing its task that’s why false alarms are very minimal.

Contact alarm sensors have ‘switch sensors’ which determines if a window is just being opened by people in the house or in the car. This is ideal for home use where windows can be rigged without so much difficulty.

Pressure Sensors
More popularly seen in museums and banks in heist movies, pressure sensors work by detecting change in air pressure within the car surroundings. It utilizes ultra-sensitive ‘speaker cones’, which move when air pressure shifts, usually when the car door or window is opened. It recognizes even the slightest change in pressure and immediate trips the sound alarm.

Sound Sensors
Sound sensors work similarly as window sensors, using microphones to pick up excessive amount of sound that may be coming from a bunch of thieves just outside the car. It may not include actual ‘contact’ but it catches sounds which makes contact with the microphone.

Unless the thief plans to drag the car as he tries to make his escape, the immobiliser will put a halt to whatever dark plans he has. With the car completely motionless, there is no chance it is going anywhere, unless the driver has the key that will enable or disable this type of alarm system. Immobiliser is often a default setting whenever there has been a breach in the alarm system.

Immobilisers are most of the time sold separately from any alarm system. However, more high-level alarm systems also include this feature pre-installed.

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