The user is authenticated via the Bluetooth function of the smartphone (BLE, Bluetooth LE). You do not have to memorize the password key for user authentication, and even if you have a smartphone, the user is authenticated and the door opens.- Android 4.3+ (BLE supported)- The behavior may not be clear in Bluetooth Spec 4.0.- In Android 6.0+, you must authorize your app to use location services before you can use it.Screen overlay detected PopupSettings -> Application Manager -> Lobby Phone -> Privileges -> Resolved with Full Privilege Activation