Heavy 18 gauge steel construction with precise fittings makes it virtually impossible to pry open with hand tools. Soft foam interior. Built-in computer blocks access after repeated invalid keypad entries. Unique No-Eyes keypad allows for quick access. Uses one 9V alkaline battery (not included). Audio and LED low battery warning. Comes with security cable, two backups keys, and instruction manual. Fits most tablets and e-readers. An excellent storage system for guns, knives, ammo, jewelry, coins, cash, personal papers and other valuables. Measures 12" x 10 1/4" x 3 1/2". Empty weight is 7.5 lbs.