A time-delay combination lock is most commonly a digital, electronic combination lock equipped with a delay timer that delays the unlocking of the lock by a user-definable delay period, usually less than one hour. Unlike the time lock, which unlocks at a preset time (as in the case of a bank vault), time-delay locks operate each time the safe is unlocked, but the operator must wait for the set delay period to elapse before the lock can be opened.
A time-delay combination lock is a digital electronic lock with a timer that delays unlocking until a user-set period, usually less than an hour. Unlike a preset time lock (like a bank vault), this type of lock unlocks each time the safe is opened but requires a wait for the set delay before it can be opened.