Most have the ability to unlock and lock your doors, roll windows up and down, and turn lights on and off when you enter and exit the vehicle. It s nice to know your car is secure, but even better to not to have to fumble with keys in the dark to get your door open. These are systems that allow you entry and exit of your vehicle. They add convenience, thus the name. These systems can also turn on and off the interior light when entering and exiting the vehicle.
Most popular features are unlock and locking of the doors remotely.
These systems are not considered alarms because they do not have intruder sensing ability built in. These systems are very popular in cold or harsh climates. They allow you to start the vehicle via remote control. The most popular use of this is when the user is inside the house and wants the car warmed up or cooled down. Thus they can then enter their vehicle without having to wait for the car to reach the desired interior temperature.