Aftermarket alarm systems starts with a basic intruder detection and siren alarm to one which can send you a text message if your vehicle is stolen and allows you to track the exact location using GPS as well as an option to send commands via mobile phone to immobilise the vehicle, lock doors smoke screens or any other programmable actions.
A good quality basic car alarm system should include an immobiliser if you do not have one already fitted and an output to the central locking system so when you arm the alarm from the alarm remote all the doors will lock. Some car alarm systems can make use of you existing central locking remote control so that when you use your exiting remote to lock up a signal is sent to the alarm to arm it and disarm when the doors are unlocked.
» Read more: Car Alarm System – Basic Alarms to SMS Remote Controlled Tracker for the UK