The Delta uses Bluetooth Low Energy (BLE) to sync with the app.
For best results be sure to have your phone’s Bluetooth on at all times (normally under Settings > Bluetooth or Settings > General > Bluetooth), so the Delta can sync regularly with the app. Data will automatically sync to the app each time you open the app, so long as your device and phone are nearby (within 8-10 metres [26-33 feet]).
You can also use the manual sync option in the app at any time.
The Delta stores 3 days of data under normal use, so we recommend opening up the app every day to keep your data and ratings up to date at all times