A remote for a car is simply a key less system of entry. You have an electronic lock that gives you access to the car without making use of a traditionally cut mechanical key. It is basically an electronic remote control that can be used as a key. This kind of a key is used a great deal in vehicles. It gives you the basic abilities of a car that gives you the ability to access the car without actually touching it.
One of the first remotes for cars came with the French Renault in 1982 and it then went on to several other American brands to now becoming a staple with most cars. Car remotes have a radio transmitter that works on a short range of 15-60 ft. When you press the activation button it sends a signal to the car which is mechanically interpreted and the car can be unlocked this way. In general American cars work on a 315 MHz frequency. Car from Europe, Japan and Asia has cars that operate on high frequencies of 433.92.
The general practice is to have the lock beep twice when it is unlocked and a single time when it is locked. If you hear four beeps it means everybody in the car has not buckled up. One long beep will be for the trunk as well as the power tailgate. A single sharp beep is meant to indicate that the system is set and everything else is secure.
All of these functions with a remote key less entry are placed on a key fob. In some cases it is placed on the handle of the ignition itself. You will have buttons that will let you lock doors and also open trunks and check on the tailgate. You could even get the remote to open some sliding doors for you or hold them in place. There is always a red button on the remote that you can press on in the case of an emergency like a theft. It will shut down the car and not allow it to be moved at all.
It is one of the most interesting things to have a when you are dealing with the automatic keys is that you will find it on every brand conceivable. When you choose your car remote, weigh in all the relevant factors and make a choice for the best.