Ollieroo 0.3 CF Digital Electronic Keypad Lock Small Safe Box Home Security Box for Office Hotel Gun Jewelry Black Brand:Ollieroo Constructed with 2mm Thick Solid Steel;4mm thick front door for More Security;0.76" thick door bolt for secure locking Opens with digital PIN or included override key;Hidden lock with one key.Security code from 3-8 digits using any number from 0-9 and time out period after 4 incorrect combination attempts Pre-drilled holes inside the safe with fixing bolts allowing anchoring (2 Bolts included) Runs on 4 AA Batteries(Non-Rechargeable Batteries Included ); Exterior dimensions : 9.1" x 6.7" x 6.7" ; Interior Dimensions: 8.9" x 6.5" x 6.6"