Large and Safe Storage: The capacity of the large combination key box is large enough (inner size is about 4.5 x 3.7 x 2 inches) to hold house keys, office or other large car keys; if necessary, youcan also store a few. small things, like credit cards, ID cards, etc. Two unlocking modes: This combination key safe has a 4-digit code and an emergency key; it allows you to define up to 10,000 combinations. You can set your own password and change it regularly for moresecurity, which makes it difficult to decipher. If you forget your password, the recovery key will be more useful to you Easy to Install: This outdoor key safe comes with 4 screws and 4 nylon expansion anchors, ensuring the key box can be installed on any solid surface. No hassle or extra work fordrill a box in the wall at a higher cost. SOLID CONSTRUCTION: Our wall mounted key box is made of durable aluminum alloy, which is waterproof, corrosion resistant and weather resistant. Ideal for outdoor installation. Wide Application: This large outdoor key box can be widely used in home, garden, office, etc. It will be a great help in any occasion. It allows you to keep and protect your car keys while yousurf, rather than risk hiding them under sand/rocks etc.