What is a fob?

A fob is a small device that can be used to remotely control a security system, such as a car alarm or keyless entry system. It is typically made of plastic or metal and has one or more buttons that can be pressed to activate or deactivate the system. Some fobs also have additional features, such as a panic button, remote start, or trunk release. Fobs are commonly used in car keys as a convenient way to lock and unlock vehicles without having to insert a physical key into the lock. They typically use radio frequency (RF) signals or infrared (IR) signals to communicate with the security system or vehicle.