Large & Safe Storage: The large key box has enough capacity (about 4.5 x 3.7 x 2 inches inside) to hold house keys, office or other large car keys; if needed, you can also You can store some small things, such as credit cards, ID cards, etc. Two Unlocking Modes: This combination key safe has a combination from a number to 4 digits and an emergency key; it allows to define up to 10000 combinations. You can set your own password and change it regularly for added security, making it difficult to crack. In case of forgetting the password, the emergency key will be more convenient! Easy to Install: This outdoor key safe comes with 4 screws and 4 nylon expansion wall anchors to secure the combination key box to any solid surface. No fuss or extra work required to drill a box into the wall at a higher cost. STRONG CONSTRUCTION: Our wall key box is made of durable aluminum alloy, which is waterproof, corrosion resistant and weather resistant. Ideal for outdoor installations. Wide Application: This large outdoor key box can be widely used in home, garden, office, etc. It will be a great helper for any occasion. It allows you to keep and protect your car keys while surfing, rather than risk hiding them under sand/rocks etc.