External (mm): 250H x 350W x 300D Internal (mm): 242H x 345W x 245D Volume: 20 litres Electronic Locking You open your safe using a code you choose yourself, so it's easier to remember and it's just as easy to re-set. When you enter your secret user code, the motorised bolts withdraw and the door opens automatically. To override the electronic lock, the safe can always be opened through the high-security six lever lock with a double-bitted high security Yale key. The key hole is concealed behind the Yale logo badge. 22mm Electronically motorised locking bolts with 6 lever double bitted (reinforced) manual override key system, 2 Yale keys supplied. Laser cut door (1mm gap) with reinforced hinge and mounted opening spring. Digital keypad with blue backlight LCD display. Plastic buttons, 4 incorrect entry alarming. Combination of 3 to 8 digits. Low battery warning. Display code on/off function. Sound on/off function.