To resolve the issue of your NoiseFit device not working, you can follow these systematic troubleshooting steps:

1. Sync Your Device:
- Open the NoiseFit app on your smartphone.
- Swipe down on the homepage screen to sync your watch with the app. This can help ensure data is synchronized correctly. If syncing does not work, try restarting the watch and syncing again - learn more.

2. Check Power and Charging:
- If the watch does not turn on, ensure that the USB power source you're using is functional.
- Examine the charging contacts on the dock to ensure they are clean and in good condition. Make sure the watch is securely placed on the dock for charging - learn more.

3. Reset Bluetooth Connection:
- Go to your phone's Bluetooth settings, locate your NoiseFit device, and select 'Forget' or 'Unpair'.
- Restart both your smartphone and the NoiseFit device.
- Follow the pairing process again to reconnect the watch to the NoiseFit app - learn more.

4. Update the App and Firmware:
- Make sure the NoiseFit app is updated to the latest version available on your device’s app store.
- Check for any firmware updates for the NoiseFit watch through the app, as these updates can resolve existing bugs.

5. Check Permissions:
- Ensure the NoiseFit app has the necessary permissions enabled on your phone to function properly. This includes permissions for Bluetooth, notifications, and other relevant settings.

6. Refer to User Guides and Support:
- If the problem persists after trying the above solutions, consult the NoiseFit user guide or support resources for additional troubleshooting methods - learn more.

Following these steps should help in diagnosing the problems with your NoiseFit device. If you still encounter issues, reaching out to Noise's customer support for further assistance might be necessary.