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Part of the car's security system, the remote alarm fob enables a remote keyless central locking system which means by pressing a button on an electronic remote control the locks included in the set will lock or unlock and this can also be set to activate or deactivate the alarm system on the vehicle.

The locking and alarm systems on a vehicle are important safety and security features.  Locking the doors is the first step in vehicle security and the car alarm is an added measure. There are a whole range of locks on a vehicle, such as wheel locks; door locks; airbag locks; ignition locks; locks for the dashboard; boot locks and fuel cap locks, to ensure the car and its contents remain secure. The most common locks, and perhaps the most critical in terms of overall vehicle security, being for the doors, boot and ignition. The locks covered by the remote alarm fob will be  dependent on the car manufacturers specifications.  The alarm fitted in a car is designed to deter would be thieves from stealing the car, or any belongings  kept within it. Most alarms  have an electronic sensor, known as a shock sensor, and a control unit, which connects to the battery of the car. When the alarm is activated, it's set off by vibration picked up by the shock sensor, for example, or by a change in voltage caused by a door being opened or the ignition being turned  on,  for  instance,  which  the  alarm  recognises  as  an  intrusion.

Unlocking a vehicle without the use of a key, which also activates or deactivates the car alarm, is a handy feature and common in modern cars. The remote alarm fob allows easy, quick and secure entry to the vehicle and peace of mind when leaving the vehicle parked unattended. A remote alarm fob can work from up to a distance of 20 metres. It works with a radio transmitter, which sends a signal via radio waves to a receiver box placed in the car. When the button on the alarm fob is pressed, the receiver in the car picks up the signal sent by the fob and this activates the locking or unlocking of the car doors, and either sets or deactivates the alarm. Usually this action is accompanied by a specific sound, such as a beep or chirp and/or flashing head and tail lights, which confirms to the driver that the doors have been locked or unlocked. Some keyless vehicle entry systems will also close windows that are open and the sunroof, at the same time as remotely locking the car. Some systems will  also include a remote keyless ignition which, when activated, will start the engine. A smart key system, available on some vehicles, allows hands-free entry without even having to press a button. A proximity sensor housed in the car picks  up a signal when the keyless fob is within a certain proximity of the vehicle and either locks or unlocks the doors accordingly, while also activating or deactivating the alarm.  Remote alarm fobs are designed to be vehicle specific and the features, functions  and particular operating instructions will vary from car to car. Buying a remote alarm fob will ensure you get the right part for the make and model of your vehicle, meaning it will fit securely and work properly which will essentially prolong the life of this part.

Problems with the remote alarm fob could be down to a dead battery, which will need replacing and the remote will more than likely need to be reset. The buttons on the remote fob can become worn and issues can occur with the contacts wearing out inside the fob, causing it to malfunction. When Buying the remote alarm fob you'll get the right replacement part that's completely compatible with the make and model of your car.