The button on your car door handle is part of the keyless entry system, allowing quick locking and unlocking once the car ...

There are several options for standalone remote starter kits, which are extremely basic and simply add the functionality of being able to start your vehicle remotely.

Some automakers have even expanded the remote start button's functionality and/or use a different icon — that's why BMW has a diamond button on its key fob, for instance.

The keyless car is a marvel of engineering. But how is it that they can start even when the battery in your key fob goes dead? The answer lies in science.

Hate Touchscreens? See How This EV Lets You Add Buttons Every car with a touchscreen should work like this. Oh, and its accessory game is worthy of Apple itself.

If you have a key fob and have ever been curious about the circle arrow button and its function, here's what it means.