Large Secure Storage: The capacity of the large code key box is large enough (inner size about 4.5 x 3.7 x 2 inches) to place house, office or other large car keys; And you can also store some small things if necessary, such as credit cards, ID cards etc. Two Unlock Modes: This code key safe features 4-digit numeric code and emergency key; It allows to define a maximum of 10000 combinations. You can set your own passcode and change it regularly to improve security, which makes it difficult to crack. The emergency keys can be more practical in case of forgetting the code Easy to Install: This outdoor key safe comes with 4 screws and 4 nylon expansion wall anchors to ensure the key box can be mounted to any solid surface. No fuss or need for extra work to have a box drilled into the wall at much more expense. Solid Construction: Our wall key box is made of strong aluminum alloy, resistant to water, corrosion and weather. Perfect for exterior mounted. Wide Application: This large outdoor key box can be widely used in home, garden, office etc. It would be a great helper for any occasion. It allows you to keep and secure your car key while surfing, instead of risking hiding it in the sand/under a rock etc.