High Security: Our combination key case is made of solid aluminum alloy, which is waterproof, corrosion resistant and weatherproof. Ideal for outdoor installations. A protective cover protects the combination dial from unpredictable weather conditions. Large Capacity: The capacity of the outer large key box is quite large (inner size is about 11.5 x 8 x 4.3cm), which can hold house, office or other large car keys; if necessary, you can also store some. small things, such as credit cards, ID card, etc. Two unlocking modes: This key safe has a 4-digit combination and an emergency key; it allows to define up to 9,999 combinations. You can set your own password and change it regularly for added security, which makes it hard to crack. If you forget the password, a backup key can be more convenient! Wide Application: This large combination key safe can be widely used in home, garden , the office, etc. It will be a great help in any occasion. It allows you to keep your car keys safe while surfing, rather than risk hiding them in sand/under rocks etc. Easy to install: This key safe box comes complete with 4 screws and 4 nylon wall anchors to ensure the key box can be installed on any solid surface. A box can be drilled into the wall for a little extra money with no hassle or extra work required.