LOCK BOX APPLICATION: for indoor and outdoor use; wall mount key safe is best used for key and access card storage; Large internal cavity allows secure storage for multiple keys EASE OF USE: resettable 4 digit combination for keyless convenience, set and reset your combination allowing thousands of personalized combination code options. Simple installation (mounting kit included) BUILT TO LAST: lockable key storage designed for installation to a wall or other fixed object; metal body construction for durability and shutter door to protect combination dials from weather IDEAL FOR SET OF KEYS: exterior dimensions (H x W x D) 11, 9cm x 8, 5cm x 3, 6cm; Interior dimensions (H x W x D) 9, 2cm x 6, 4cm x 3cm EASY TO SECURE AND SHARE YOUR KEYS: great solution for AIRBNB and home rental. Gives easy access to care takers and home workers. Ideal to share keys with your family or roomates.