a piece of leather or other material to which a key or group of keys is fastened

Everything from mouse pads to key fobs with his image on was on sale. 所有印有他照片的东西都在打折，从鼠标垫到钥匙扣都有。

an electronic device connected to a key that is used to lock and unlock a car's doors or operate a piece of equipment

He presses a button on his key fob and electronically operated gates swing silently open. 他按下遥控钥匙上的一个按钮，电动控制的大门无声地打开了。