Ozone 40 Litres Digital Safe Locker for Home & Office – Digital Lock, 1-Way Unlocking (Password), Size: 420H x 350W x 360D mm, Weight: 20kg, 2-Year WarrantyDual Password (User+Master) The safe has an inbuilt system to create a 3 6 digit user and master password. If the password is forgotten, the safe can be opened using the master password Code Hiding Function If you do not want to disclose your password, use the asterisks key on the operating panel to hide the code External Battery Back up The safe is operated by 4 x 1. 5 V AA batteries. If the battery is drained, there is an option of external battery