Secure Key Box External dimensions (HxWxD): 4.53 X 3.43 X 2.16 in, internal dimensions (HxWxD): 3.94 X 3.15 X 1.18 in. This safe key box can be used indoors or outdoors. It provides ample and secure internal storage space for your valuables, enough to store keychains, credit cards, car keys, cash, or other small items. Our code key box uses a 12-digit combination that offers thousands of options to ensure maximum security, significantly more than the much harder-to-crack 4-digit models. It's easy to set your desired combination anytime. We recommend taking a photo or writing down the information after setting a new code. If you forget the password, you will no longer be able to use the key box. Installation The wall-mounted key safe includes all necessary mounting hardware, namely 4 screws and 4 nylon expansion plugs, along with an installation mode. Plus an user manual. Simply insert the screws and plastic expansion anchors, drill into the wall or other hard surface, and ensure the safe is securely installed. Code Keys With this secure key safe, you'll never have to worry about your hidden keys under the mat being stolen from you. This 12-digit safe allows you or others to access the key anytime, making it highly suitable for daily activities, friends, family, housekeepers, emergency exits, pet guards, property matters, etc.