keyfob
nounUK /ˈkiː.fɒb/
US /ˈkiː.fɑːb/
A small thing you carry that opens a car or door with a button.
She pressed the button on her keyfob to unlock the car.
RELATED WORDS
OTHER MEANINGS
2. A small chain or ornament attached to a key ring.
He bought a leather keyfob as a souvenir.
3. A small electronic device that gives access to a building or service.
Guests use a keyfob to enter the gym after hours.
4. A tag or badge worn to identify the holder.
The runner's keyfob showed his race number.