The Burg Wachter KM5 Combination Key Safe is designed for outdoor use and should be installed on an exterior wall and is an inconspicuous way to securely store your spare or emergency keys. The safe operates with a four wheel user changeable combination lock allowing the user to keep the keys to their property on site but away from undesirables. This key safe holds up to 4 keys that are up to 90mm in length and is ideal for use by carers, workmen, and school children.