Bluetooth Low Energy (BLE) devices may have background communication temporarily restricted by the battery management policies of mobile operating systems (Google Android / Apple iOS).

1. Allow background app permission (required)

2. Android: In smartphone [Settings] > [Apps] > [b.ring] > [Battery], change the setting to “Unrestricted.”

3. iOS: In smartphone [Settings] > [b.ring], enable “Background App Refresh.”

4. Bluetooth interference and distance: Due to the nature of Bluetooth, having many wireless devices nearby (Wi-Fi router, other Bluetooth devices, etc.) or being too far from your smartphone can disconnect the connection. When sync drops, restart the app while keeping the ring and smartphone close together.