The installation of a secret is an inexpensive but effective way to increase the stability of the anti-theft system. An anti-theft lock is usually disabled by pressing one or more of the vehicle's standard or optional buttons. This type of lock is a surprise for the hijacker. The secret can not be scanned, can not be muffled, you will not lose or you will not pull out the key chain. After repeated repetitions, you will not forget the sequence of keystrokes to unlock the lock. At its core, the secret is a device that blocks the engine. There are secrets equipped with motion sensors. Such secrets allow, for example, to remotely warm up the engine, of course if such a function exists in your alarm.