HIGH SECURITY: Our combination key case is made of sturdy 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 and storage space: The capacity of the outer large combination key box is quite large (inner size is about 11 .5 x 8 x 4.3cm) for placing house, office or other large car keys; you can also store small things if necessary. , Such as credit card, 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. A backup key could be more convenient when you forget the code Wide Application: This large combination key safe can be widely used in home, garden, office, etc. It will be a great help in any occasion. It allows you to keep your car keys safe while you surf, rather than risk hiding them in the sand/under rocks etc. Easy installation: this outdoor key safe Comes complete with 4 screws and 4 nylon wall anchors to ensure the combination 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.