TABLE OF CONTENTS

• Quick Troubleshooting
  • 1. Earbuds Do Not Turn On
  • 2. Bluetooth Is Not Connecting
  • 3. Earbuds Switch Off During Pairing
  • 4. Only One Earbud Is Working
  • 5. Bluetooth Connected but No Sound
  • 6. Touch Controls Are Not Responding
  • 7. Calls Are Not Working
  • 8. Voice Assistant Is Not Opening
  • 9. Music / Game Mode Is Not Switching
  • 10. Earbuds Are Not Charging
  • 11. Charging Case Is Not Charging
  • 12. Battery Backup Seems Low
  • 13. Earbuds Keep Disconnecting
  • 14. Earbuds Enter Power-Saving Mode
  • Still stuck?

Quick Troubleshooting

1. Earbuds Do Not Turn On

1. Place both earbuds in the charging case.
2. Make sure they are seated correctly.
3. Remove the earbuds from the case.
4. Wait for them to power on automatically.
5. If they remain unresponsive, charge the case and earbuds before retrying.

2. Bluetooth Is Not Connecting

1. Turn Bluetooth on on your smartphone/tablet.
2. Place both earbuds in the case and remove them again.
3. Search for Harmonics Twins S19.
4. Select the earbuds to pair.
5. Keep the phone within approximately 10 metres.
6. If an old pairing is saved, forget it and pair again.

3. Earbuds Switch Off During Pairing

If the earbuds remain unpaired for around 5 minutes, they switch off.

1. Place the earbuds back in the case.
2. Remove them again.
3. Open Bluetooth settings immediately.
4. Search for Harmonics Twins S19.
5. Pair the earbuds before the timeout occurs.

4. Only One Earbud Is Working

1. Place both earbuds into the charging case.
2. Check that both earbuds are seated correctly.
3. Remove both earbuds together.
4. Forget Harmonics Twins S19 from the phone's Bluetooth settings.
5. Turn Bluetooth off and on again.
6. Pair the earbuds again.

5. Bluetooth Connected but No Sound

1. Confirm Harmonics Twins S19 is selected as the active audio device.
2. Increase the phone's media volume.
3. Make sure the media is not paused.
4. Single tap an earbud to play/pause.
5. Reconnect Bluetooth if the issue remains.

6. Touch Controls Are Not Responding

Use the controls exactly as follows:

• Single tap Left/Right: Play/pause or answer/end call.
• Press and hold about 2 seconds: Reject an incoming call.
• Double tap Right: Next song/video.
• Double tap Left: Previous song/video.
• Triple tap Left/Right: Music/Game mode.
• Press and hold about 3 seconds: Voice assistant.

Make sure your taps are clearly registered and the touch surface is clean.

7. Calls Are Not Working

1. Confirm the earbuds are connected to the phone.
2. Check that Bluetooth call audio is routed to the earbuds.
3. Single tap either earbud to answer or end a call.
4. Press and hold for about 2 seconds to reject an incoming call.
5. Reconnect Bluetooth if required.

8. Voice Assistant Is Not Opening

1. Confirm the earbuds are connected to the smartphone.
2. Ensure the phone's voice assistant is enabled.
3. Press and hold the Left or Right earbud for about 3 seconds.
4. Try again after reconnecting Bluetooth.

9. Music / Game Mode Is Not Switching

Triple tap either earbud.

If the mode still does not change:

1. Confirm the earbuds are connected.
2. Perform three distinct taps.
3. Wait for the mode confirmation.
4. Retry if necessary.

10. Earbuds Are Not Charging

1. Place both earbuds correctly in the charging case.
2. Check that the case has sufficient battery.
3. Clean the charging contacts if required.
4. Close the case.
5. Connect the case to power using the supplied Type-C cable.
6. Allow enough time for charging to complete.

11. Charging Case Is Not Charging

1. Connect the supplied Type-C cable securely.
2. Try another suitable USB power source.
3. Check the cable for visible damage.
4. Make sure the Type-C port is clean and dry.
5. Allow approximately 2 hours for charging.

12. Battery Backup Seems Low

The earbuds provide up to 30 hours of music playtime.

Actual runtime depends on factors such as:

• Volume level
• Call usage
• Music/Game mode
• Bluetooth usage
• Charging condition

Fully charge the earbuds and case before testing battery performance again.

13. Earbuds Keep Disconnecting

1. Keep the smartphone within approximately 10 metres.
2. Reduce obstacles between the phone and earbuds.
3. Make sure the phone is not switching to another Bluetooth device.
4. Forget the old pairing and connect again.
5. Place the earbuds in the case and repeat the pairing process.

14. Earbuds Enter Power-Saving Mode

If the earbuds remain unpaired for around 5 minutes, they switch off.

Remove them from the charging case and repeat the Bluetooth pairing process.

Still stuck?

If the issue persists after performing all troubleshooting steps, please raise a support request.

Our support team will assist you further.

Support

• Visit: www.portronics.com
• Support Portal: support.portronics.com