The Sterling KeyMinder 3 allows for controlled access without duplicate keys and suitable for storage of door, padlock & car keys. Inside, it also has a key hook. Can also be used indoors as a small safe for valuables & credit cards. Maximum key length 11cm. Ideal for School children, cleaners, wardens, community care, rental properties, maintenance personnel. 10,000 resettable combinations with 0-0-0-0 auto stop aids opening in poor lighting.