Large Secure Key Storage BoxIt can hold up to 5 house keys or 3 large keys. Prevent lockouts and available for family, friends, AirBnB renters. NoteAfter the password is reset, it is best to take a picture, otherwise not open a method when the password is forgotten. There is a "U" spring inside the key lock box, which is helpful for unlocking. Be careful it may fall out Double Wall Construction The impact resistant cover is impervious to hammering, sawing or prying. Heavy duty steel locking mechanism with zinc alloy body. Place keys securely in our resettable 4-digit combination lock box Weatherproof, Rust-Resistant SteelSuitable for indoor and outdoor use. Your key safe features a weatherproof sliding locking cover to protect the combination dials from other weather damage Easy to InstallComes with instructions and assembly kit. All necessary mounting hardware is included: 4 screws 4 nylon expansion bolts. Installation1.Open the box, there are 4 holes in the back of the box. 2.Hold the box to the wall and mark the position of the holes with a pencil. 3.Drill holes. 4.Put plastic expansion screws into the wall. 5.Place the box on the wall and then screw in the provided screws