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Car alarms have evolved from early editions that merely sounded when a door was opened to something far more technologically advanced. Car alarms now flash your lights, unlock doors, defeat the ignition system, and some even use a computer interface to completely customize their performance. Car alarms use a combination of techniques, the most common being motion sensors and dome light detectors. When the car door opens, the overhead light comes on, triggering the alarm. Today’s automotive security systems offer multizone protection, which lets you decide what you want the alarm to protect and selectively arm and disarm individual components. Car alarms and car security systems come with an array of features. Some car security systems will let you turn off the sometimes-annoying chirp or honk that signifies arming or disarming. Some systems add a safety feature that will turn on the interior car lights when the system is disarmed, allowing for safe entry. Dual remotes are handy if the car has more than one driver--one can go with each set of keys. A field-disturbance sensor sounds with any movement inside the car. A back-up battery keeps the system armed even if the car battery dies or is disconnected. Car alarms and car security systems are a must have!
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