NOWATCH can store about 24 hours of data on the device if it is not connected to your phone or tablet via Bluetooth.
This means that you do not lose any collected data when the device can't synchronize with the app for a while.
For example, when your phone or tablet is out of Bluetooth range or when you have switched off Bluetooth, your NOWATCH will continue to record and store data.
Once your device reconnects, the stored data will be synchronized and become available in the app as usual.