An electronic lock (more precisely an electric lock) is alocking device which operates by means of electric current.Electric locks are sometimes stand-alone with an electronic controlassembly mounted directly to the lock. More often electric locksare connected to an access control system. The advantages of anelectric lock connected to an access control system include: Keycontrol, where keys can be added and removed without re-keying thelock cylinder; Fine access control, where time and place arefactors; And transaction logging, where activity is recorded.