Car remotes typically use radio waves in the 315 MHz or 433 MHz frequency bands. These frequencies are regulated by the Federal Communications Commission (FCC) in the United States. The FCC sets limits on the power output of car remotes to prevent interference with other devices.
When you press a button on your car remote, the remote transmits a radio wave signal. This signal is picked up by a receiver in your car. The receiver decodes the signal and sends a command to the car's electronic control unit (ECU). The ECU then carries out the command, such as locking or unlocking the doors or starting the engine.
Radio waves are well-suited for use in car remotes because they can travel through solid objects like walls and buildings. This means that you can lock or unlock your car even when you are not in sight of it. Radio waves can also be transmitted over long distances, so you can lock or unlock your car from a distance.
