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An automobile alarm is an audible security system which activates as a loud noise if a possible break-in is detected. Not only are these systems annoyingly loud, they also are often false alarms and consequently, often ignored. Many vehicle security systems currently exist which are much more technologically advanced.
In an effort to reduce the number of car thefts that have been costing billions of dollars each year, car manufactures have come up with several different technologies. Things like remotes with two-way communication will warn you when your car's engine has been started or why the alarm has been activated. Some of the most common car security systems include glass break sensors, two-way communication remotes and passive arming.
You will not hear an audible car alarm if you're not near your vehicle. If your car is stolen while you're on vacation, it may be many days before you know about it. Some car security systems will phone you or send you a text message if a break in occurs. A two-stage automatic car alarm can also tell you if the car's engine is running, if the car is in motion, or if the car is stationary and has just been bumped into by someone.
While the vehicle is moving you can use the automatic car alarm to turn off the fuel pump, this is an effective way of bringing the vehicle to a stop. However, if your car is on a tow truck this will not make any difference in stopping the theft from occurring. Many of today's new vehicles also come with GPS tracking, which allows you to know where the vehicle is at all times.
Keeping Car Jackers at Bay: Many vehicle alarm models come with a built-in anti-car-jacking mechanism, which allows you to cut the gas by just pushing a button. The switch is generally nearby the seat belt release, and once pressed it will cut off the gas and put on the brakes to bring the vehicle to a halt. This puts you in control when a dangerous situation might have made you a victim. Having this system means that you can be proactive in making sure that your car is always safe from being stolen.
Often these systems will alert police in the event of a car jacking. Most systems are intended to quickly notify authorities that something is happening and can be invaluable in life-threatening situations. Approaching a car thief in the middle of stealing your vehicle can be very dangerous. It is better to let law enforcement handle the situation. Once your automatic car alarm informs you with a phone call or text message that the car is being stolen, you can notify the police, who will have a head start on catching the thief in the act.
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Source: http://ezinearticles.com/?Automatic-Car-Alarms—Keep-Your-Car-From-Being-Stolen&id=1602891