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 4 digits password and 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. Emergency keys are even more convenient if you forget your password! Easy to Install: This outdoor key safe comes with 4 screws and 4 nylon expansion wall anchors, which ensures that the combination key box can be installed on any sturdy 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 sturdy aluminum alloy, which is waterproof, corrosion resistant and bad weather. Ideal for outdoor installations. Wide Application: This large outdoor key box can be widely used in home, garden, office, etc. It's 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.