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 lock is a digital electronic combination lock that delays unlocking until a user-defined period, typically less than one hour. It differs from a preset time lock (like a bank vault) in its operation: it unlocks each time the safe is opened but requires a wait for the set delay before it can be opened.