ABUS 787 SMART-BT KeyGarage™ for wall mounting. It holds up to 20 keys, three car keys or up to 30 plastic cards on a temporary and flexible basis for various groups of people. Inside there are two hooks for keys.As an admin, you can generate a six-digit key code for others in the app, which will give them access to whatever is stored in the smart KeyGarage without the use of a smartphone; e.g. for guests in a holiday rental, workers, cleaning service, mobile care services and more. Another option is to send an electronic access ticket via the app.Equipped with the current, most secure AES-128-Bit encryption. The batteries can be changed any time without having to open the KeyGarage™ 787 Smart-BT. We recommend using the KeyGarage™ 787 Smart-BT on the wall in a protected outdoor area. Specifications: Dimensions ( Height x Width x Depth):External: 120 x 82.5 x 63mm.Internal: 98 x 72 x 33mm.