An active wireless electronic device that controls access to buildings or vehicles, such as a remote control for a car door lock.
A passive wireless electronic device that usually uses RFID technology to control access to buildings, containers, computers, etc. by being placed near a detector.
An item carried on a key ring either as decoration or security.
A device used to operate an appliance (such as a television, vehicle, or mechanical toy) from a short distance away.
A means of operating a device from a distance.