When open one drawer, others can not be opened by any forces. Specially, it enhances safety and convenience for any place where one person has to manage/keep various valuables (for example: pawnshops and jewelry shops.) Locking device : Largard Digital lock - Operated by Manager and Users added by manager - Allowed to make lock disable with time delay function during one absence - Four consecutive invalid codes initiates five minute delay. - Other alarming functions