A key fob is a small, electronic device that's attached to a key ring or chain and used to unlock doors, start vehicles, or remotely control other devices. Key fobs are also known as hardware tokens and are a type of physical security token, along with smart cards and biometric keyless entry fobs.
Key fobs work by using radio frequencies to send a coded signal to a receiver unit in the device. The receiver unit contains an RFID tag that matches the information transmitted by the key fob. If the information matches, the system will open the door or perform the desired action.
Key fobs can be programmed to perform a variety of functions, such as unlocking or locking a vehicle, opening the trunk, or starting the engine. Some key fobs are essentially badges that can be passed in front of an electronic lock to open it.
Key fob entry systems can be made more secure by using advanced encryption protocols and multifactor authentication

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