1. External dimensions (height x width x depth) of the large outdoor key box with a wall-mounted safe: 4.53 x 3.43 x 2.16 inches. Internal dimensions (height x width x depth): 3.94 x 3.15 x 1.18 inches. It has a large capacity, sufficient to store remote keys, bank cards, car keys, cash, or other small items. 2. The sturdy aluminum alloy and durable steel locking mechanism give the box additional strength and enable it to withstand the impact of a hammer or drill. The combination key box has multiple 12 - digit combinations, providing strong protection. 3. The waterproof external keyboard comes with an instruction manual in 5 languages, a screwdriver, and a set (4 screws + 4 expansion plugs). Installation can be completed in just 4 simple steps: outline the screws, insert into the holes on the expansion plugs, and then insert the box with the screws. It is very suitable for both indoor and outdoor use and is suitable for storing keys, cards, and jewelry. 4. For easy access, when you are not at home, your friends, family, and neighbors can obtain spare keys from the secure key safe. Thank you for purchasing products from our high - quality store. Have a great day!