A key fob is a small device used to tether keys together to avoid misplacing them.
It should mention that it could also refer to the remote car starter that you are required to have near your car.
A key fob, or remote keyless entry (RKE), is a hand-held wireless transmission device for unlocking or locking an automobile door and in some cases starting the engine from distances up to 30 metres away. Keyless access systems can sense when someone comes nearby and automatically unlock the doors, they can be programmed not only for individual users but also with temporary codes so visitors can get in without having to fumble with keys. It’s based on RFID technology like what you find in contactless credit cards and keycards.
Key fob can also refer to a small device used for starting an engine or igniting the fuel in diesel engines. Keyless start refers to when you don’t need to use your keys to start your car – it could be done remotely with the push of a button, or automatically when you approach your car. This can be done wirelessly by a controller that connects to your car’s OBDII diagnostic port, or the key fob you already use to lock and unlock your car can also start it.
