Product Detail ETL verified Electric lock that requires 4 AA batteries that are NOT included 1-Hour fire protection Exterior dimensions: 23 3/4"H x 18 19/32"W x 19 5/16" D Interior dimensions: 19 21/32"H x 14 13/16" W x 11 7/8"D . The "SentrySafe OS5449 Safe Fire-Safe Combination Safe, 2.0 Cubic Feet, Gunmetal Gray" is best product for you. We recommended SentrySafe OS5449 Safe Fire-Safe Combination Safe, 2.0 Cubic Feet, Gunmetal Gray