0.5 Cubic Feet Safe BoxThe capacity is enough for you to keep all kinds of valuables, such as cash, legal documents, passport, jewelry, gun, and so on. Whether you are on a long vacation or just going to work, it can protect your precious property safe to go out at ease.Product DimensionsExterior measurement: 13.8 x 9.8 x 9.8 inchesInterior measurement: 13.5 x 8.75 x 9.5 inchesDoor thickness is approximately 2 inchesCareful DesignInside the security safe, there’s a soft carpet to protect jewelry, heirlooms, or other delicate items that are safeguarded against scratches or damage.How to use the safe box?1.The safe is shipped locked. To open it for the first time, use one of the two keys provided.2.Install four AA batteries (not included). The battery compartment is behind the door.3.Reset passcode: There’s one button on the door’s medial part, press it and then input the new passcode(3 to 8 digits). Each pressing results in one buzzer beep and yellow light flashes. Then press the inch#inch button and the green light will be on.4.Rotate the knob clockwise and pull outwards within 5 seconds, the door is opened.