BARSKA External Battery Pack for Biometric Safes Compatibility: AX11224 Standard Biometric Safe, AX11620 Compact Biometric Safe, AX11650 Large Biometric Safe, AX11652 Four Rifle Biometric Safe, AX11898 Large Biometric Rifle Safe, AX11780 Extra Large Biometric Rifle Safe, AX11556 Top Opening Biometric Safe, AX12038 Wall Mounted Biometric Safe, AX12408 Large Biometric Wall Safe Body Material: Plastic Length: 7" / 17.78cm Batteries: Holds 4 AA Batteries, Not Included Dimensions: 2.5 x 2.75 x 0.7" / 6.35 x 6.99 x 1.78cm