Car alarm is probably the only type of alarm that has got so many features available. The new features are constantly appearing on the market. Here is the list of the most common features.

Air Horns: Air horns are placed externally to attract more attention and cause troubles to the thief if he makes it into the interior of the car.

Active Re-arm: Having disarmed the alarm the system will automatically re-arm after a definite time period if a door is closed. This will help to prevent unintentional disarming by the remote transmitter.

Arm: Turning the alarm to an active state.

Brain: The alarm’s main box controlling the sensors and other connected equipment.

Anti-Code Grabbing: A method of changing the code of the alarm with every arm/disarm. Its aim is to defeat code grabbing equipment that can define and change your code to disarm the alarm.

Carjack Protection: If activated, this feature will turn off the engine and make the siren sound. This type of protection is used when a car is taken forcefully from the owner.

Channels: The alarm’s number of outputs the transmitter may control.

Disarm: Turning the alarm to an inactive state.

Emergency Disarm Switch: Emergency alarm disarming by a hidden switch.

Dome Light Illumination: Turning on the car’s dome light when disarming the alarm.

Flashing Lights: When an alarm is set off, the lights or parking lights flash. Also when the alarm is armed or disarmed the lights will flash one or more times for confirmation.

Door Lock/Unlock: Possibility of car locks to be operated by the alarm.

Ignition/Starter Kill: Disconnecting the ignition/starter when the alarm is armed.

Key-in Features: Features that activate when the key is put into the ignition of the car.

LED: Light emitting diode is a small light emitting device situated inside the car to warn thieves of the alarm's presence.