key fob
US /ˈkiː fɑːb/
UK /ˈkiː fɑːb/
1.
a small remote control device that allows you to lock and unlock a car or other vehicle without using a key, and often to start the engine or open the trunk remotely
:
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I accidentally locked my key fob in the car.
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My car's key fob needs a new battery.