# key fob

> English word · Noun

## Definitions
1. An item carried on a key ring either as decoration or for security.
2. A passive wireless electronic device that usually uses RFID technology to control access to buildings, containers, computers, etc. by being placed near a detector.
3. An active wireless electronic device that controls access to buildings or vehicles, such as a remote control for a car door lock.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/key-fob