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The headphones automatically shut down after 30 minutes of inactivity.

1. Clear the pairing records between the headphones and all of the previous devices.
2. Re-pair your headphones and the device.
If that doesn’t work:
- Try pairing with another device to check for compatibility issues.
- Ensure there are no objects blocking the Bluetooth signal.

To connect two devices:
1. Pair the headphones with device A.
2. Disable Bluetooth on device A, and the headphones will enter pairing mode.
3. Pair the headphone with device B.
4. Re-enable Bluetooth on device A and reconnect to the headphones.
After this initial setup, the headphones will automatically connect to both devices next time.

You can try the following troubleshooting steps:
- Check the audio source: Test different types of music and make sure the audio source is clear and free of distortion or noise.
- Customize the EQ settings: Use the QCY app to try different EQ modes or customize the sound profile to suit your preferences.

Real-time monitoring of changes in the environment and audio leakage to adjust noise-cancellation capabilities. With adaptive noise canceling, you can experience the optimal effect of noise reduction and maximum tranquility. Please note that this feature is off by default and can be enabled via the QCY app.