HIGH SECURITY: Our combination key box is made of sturdy aluminum alloy, which is water, corrosion and weather resistant. Ideal for outdoor installation. A protective cover protects the combination dial from unpredictable weather conditions. Large and Storage: The capacity of the exterior large combination key box is quite large (internal size is about 11.5 x 8 x 4.3cm), which can hold house keys, office keys or other large car keys; if necessary, you can also store small keys. things, such as credit cards, ID cards, etc. TWO UNLOCKING MODES: This key safe has a 4-digit code and an emergency key; it allows you 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 your password, the backup key will be more useful for you! Wide Application: This large key safe with password can be widely used in home, business, garden, office, etc. It will be a great help in any occasion. It allows you to keep and protect your car keys while surfing, rather than risk hiding them under sand/rocks etc. EASY TO INSTALL: This outdoor safe for keys about product accessories Cat's eye screw: 10cm screw + 3.8cm gasket Expansion screw: #6 drill bit (drilling) ( The accessories are gifts, according to the configuration of 90% of the country's doors, if you have too much trouble, please go to the nearest hardware store to match them, thank you for your understanding). to ensure that the combination key box can be mounted on any solid surface. No hassle or extra work drilling a box into the wall at a higher cost.