Car Alarms system is a very important accessory which is needed to sense anelectric current and motion in a car.  There are many accessories like , Car Stereos which have marked their own place inthe line of car accessories. Whereas Car alarm being on the top of any othercar accessory is a kind of device whose main purpose is to detect someonetampering with your car. It there by warns the intruder in a stern voice thatthere is an alarm set and he will be in trouble. Car alarm have siren whichcompletely sound for 30 seconds when the car senses a repeated and a heavyshock the voice shouts at a warning at a 127 db.

An instant panic feature of women voice is also used as car alarms which wouldscream out for help. This attribute very nicely helps to locate your car easilyin a parking lot which is crowded totally. Laying an impact on the car, thesensitivity of the alarm is been also set which would be greater than thethreshold will start activating the alarm. You can also set the sensitivity ofthe alarm by striking your to set the shock into a threshold.

San Francisco Car alarm is very simple and easy to use which you can easilyinstall them anywhere under the hood. To clip the power cord to the battery,there are three metal screws; either the voice or chirping which is used by thecar alarm as an armed or as disarmed confirmation.

Becoming the need of today, are attracting many people to invest on them.And simultaneously there are many thieves who are on the track of mastering theart of stealing and revamping the cars to start off their own business ofdealing in stolen cars.

The application of car alarm has also reduced the increasing number of crime inthe city like San Francisco.With the help of this system installed you can easily keep your car safeanywhere.  The system is completely loaded with sensors, sirens andsignals that gives a warning alarm in case of car theft. A switch is there onthe driver's door wired on the siren in the basic version of car alarm system.If anyone opens the door, siren will start wailing.

Getting better and better now a days, the anti theft alarm system works best innew high tech cars coming to San Francisco. Anti theft alarm system is also build incars comprising of various kinds of radio receiver, auxiliary battery, sensors,siren and computer control unit. The motion, pressure and touch on the car areeasily detected by the diverse sensors loaded at different places. Sometimessiren is also used to yield sounds in case of car theft.