With 1.83 cubic feet of storage, the Biometric Rifle Safe has all the space you need to organize up to 4 rifles. An included rifle rack helps keep the rifles organized and a removable top shelf helpsstore accessories and handguns. By optimizing storage functionality, the Biometric Rifle Safe acts as the most effective and discrete firearm storage solution, fitting in practically any narrow space or closet. Always at the Ready Four AA batteries power the Barska Biometric Rifle Safe for 1 to 1.5 years with normal use. If you accidentally forget to change batteries, the safe comes with a backup battery pack for power when you need it. Two traditional keys are also included as an alternate means of access.