The Master Lock Large Fire & Waterproof Security Chest protects your familys most important documents (fits A4 paper size), media and valuables from fire and flood damage. Fire and water-resistant construction. UL/ETL verified 30 minutes fire protection for documents, official papers, as well as digital items (CD, USB sticks) up to 843°C. ETL verified for water submersion to protect documents and other valuable items from flood damage. The digital lock keeps documents and valuables away from prying eyes and prevents the lid from opening in the event of a fire. It has a programmable digital combination: 1 resettable combination + 1 Master combination (non programmable). Specification: Exterior Dimensions (H x W x D): 35.9 x 42.1 x 35.1cmInterior Dimensions (H x W x D): 29.5 x 30.5 x 20.6cmInterior Volume: 18.5LPower: 1 x 9V Battery (not included)Weight: 19.5kgAdditional Information:Safe Type: Fire & Water