SentrySafe Security Safe, XX Large Digital Lock Safe, 4.25 Cubic Feet, T8-331 HOME SAFE: Protect your valuables with this personal safe, complete with soft interior lining and removable shelving; use as a laptop safe, jewelry safe and more DIGITAL LOCK: Electronic safe has a programmable keypad, store up to an eight digit combination for multiple user options SECURITY: Electronic safe has three live-locking bolts, three dead bolts, steel construction, pry-resistant door, and bolt down hardware (included) to help prevent unauthorized entry or removal of your personal safe INTERIOR ORGANIZATION: Key rack and bungee organizational system for storage of easy to-misplace items SPACIOUS INTERIOR: XX large safe secures all your valuables; Interior: 26 in. H x 20.5 in. W x 14.1 in. D, exterior: 27.7 in. H x 21.7 in. W x 19.8 in. D For optimal performance, SentrySafe recommends the use of four high-quality, name branded, alkaline AA batteries with an expiration date of 8-10 years from the current year. Generic and rechargeable batteries often do not have the lifespan needed to support long term usage