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 shields the combination dial from unpredictable weather conditions. LARGE CAPACITY & STORAGE: The outer large combination key box has a fairly large capacity (inner size is approximately 11.5 x 8 x 4.3 cm), which can accommodate household keys, office keys, or other large car keys; if needed, you can also store small items, such as credit cards, ID cards, etc. TWO UNLOCKING MODES: This key safe features 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 enhanced security, making it difficult to crack. If you forget your password, the backup key will be more useful for you! WIDE APPLICATION: This large password key safe can be widely used in homes, businesses, gardens, offices, etc. It will be a great help on all occasions. It allows you to store and protect your car keys while you are surfing, instead of risking hiding them under sand/stones etc. EASY TO INSTALL: This outdoor key safe includes mounting accessories to ensure the combination key box can be mounted on any solid surface. No hassle or extra work of drilling a box into the wall at a higher cost. Cat 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, go to the nearest hardware store to match them, thank you for your understanding).