The RingConn smart ring utilizes Bluetooth connectivity for transmitting and synchronizing data. It also has the ability to temporarily store data for subsequent synchronization in case Bluetooth is deactivated. Nonetheless, please note that the ring can retain monitoring data offline for up to 7 days only. To ensure seamless data synchronization, we advise you to establish a Bluetooth connection between the ring and your phone within this 7-day window and synchronize the data to the app.