Cannon Security Products provide elegance without compromise, with the same advantages found on safes costing hundreds more. You can be confident in the security of your most treasured valuables. The electronic keypad entry Wall Vault mounts flush between the studs in your wall. This safe is also access able with a built-in backup key lock, and it features a hidden internal storage compartment. Once the combination is entered, gravity opens door. The Wall Vault is powered by 4 AA batteries.