HOMDOX Safe Deposit Box, Digital Electronic Security Box for Home Office Hotel, 0.5 Cubic Feet (12.1 x 7.8 x 7.8inch) SentrySafe black battery operated security safe; requires 5 AA batteries (included) 0.5-cubic-foot security safe with electronic lock and keys lock Reprogrammable digital access; uses AA batteries (included); Four bolts included to mount safe to wall, floor, or shelf Security code from 3-8 digits using any number from 0-9, Time out period after 3 incorrect combination attempts Dimension: 31 x 20 x 20cm/12.1 x 7.8 x 7.8inch (L x W x H)