General description The Master Lock Select Access SMART™ Bluetooth Large Key Box is designed for both indoor and outdoor use. It provides convenient access management through a Bluetooth® connection, allowing users to unlock it using a smartphone or tablet. The accompanying free app, available on the Apple Store and Google Play, enables users to share access with others, either for a single use or permanently. The key box also maintains a record of all access history and features a low battery reminder for added peace of mind. In case Bluetooth connectivity is unavailable, a backup numeric keypad is provided for access. It comes with a CR123 battery included.