The Masterlock 5412E Push-Button Select Access® Key Safe is an easy to use push button combination type safe and can be fitted to the wall inside or out. Has a very strong solid zinc body that has good resistance to hammering and sawing. The 12 buttons to set one’s own combination provides a massive 4,096 available combinations so there is no fear that it will get breached. The hinged door system means you don’t need to worry about misplacing the front. The key safe is weather resistant and will tackle and function fine, whatever the weather can throw at it. Ideal for safely leaving keys for children to get in after school so that you don’t have to be there to let them in, for an elderley family member you need to visit on a regular basis, or for storing keys safely just in case you lose them on your travels. All Master Lock products with a locking mechanism have a Lifetime Warranty against mechanical failure. External Dimensions: 131 x 95 x 60mm.Internal Dimensions: 102 x 68 x 53mm.