A good method of keyless entry or to restrict parts of buildings wherever needed and can even be set to the same code on each of the different doors and codes are easily changed.
The mechanical digital locks are keyless locks that operate via a keypad. Keying in numbers or letters enables the lock to function.
Digital locks will only allow the lock to operate and allow entry by inserting the correct access code, if a incorrect code is inserted, the lock handle or turning knob is restricted from turning fully.
This is a very popular device used in many homes and offices and different types of workplaces.