The Master Lock 540 Select Access® Key Safe enables the safe storage of house, car and padlock keys. With a Set-Your-Own 4-digit combination for keyless convenience and increased security. The shutter door protects combination dials from weather, dirt and grime. The wall mount design offers permanent installation. Can be used both inside and outside the home, office, worksite, or anywhere that restricted or safe access is required. Stop hiding your keys under the doormat or under a flower pot: Select Access® is the perfect solution to share access to your keys. Door keys can be safely left for children to get in after school, for an elderly family member you need to visit on a regular basis, or for just storing keys safely. All Master Lock products with a locking mechanism have a Lifetime Warranty against mechanical failure. This Master Lock 5401 Medium Select Access® Key Lock Box has the following specification: External Dimensions: 119 x 85 x 36mm Internal Dimensions: 92 x 64 x 30mm