Large and Secure Storage: The large combination key box has a large enough capacity (interior dimensions are approximately 4.5 x 3.7 x 2 inches) to hold house keys, office keys or other large car keys; if needed, you can also store some small things such as credit cards, ID cards, etc. Two Unlocking Modes: This password safe has a 4-digit password and an emergency key; it allows you to define up to 10,000 combinations. You can set your own password and change it regularly for increased security, making it more difficult to decrypt. If you forget your password, the recovery key will be more useful to you! Easy to Install: This outdoor key safe has 4 screws and 4 nylon expansion anchors to mount the key box. On any hard surface. No need for the hassle or extra work of drilling the box into the wall at a higher cost. Sturdy Structure: Our wall-mounted key box is made of durable aluminum alloy, which is waterproof, corrosion-resistant and weather-resistant. Perfect for outdoor installation. Wide Application: This large outdoor key box can be widely used in homes, gardens, offices, etc. It will be of great help no matter what. This allows you to store and protect your car keys while surfing without having to risk hiding them under sand/rocks, etc.