1. It might be due to a poor fit. Follow these steps to ensure they fit properly:

- Check the L/R logos on the back of the earbuds to ensure you're wearing them on the correct sides. Rotate the earbuds to find the most comfortable position.

- Try different ear tip sizes to find the best fit and create a tight seal. If one earbud doesn't fit well, consider using different sizes for each ear, such as medium in one ear and large in the other.

2.Adjust the level of noise reduction to 4 in the app to see if it helps.

Follow these steps to adjust:

1) Open the soundcore app.

2) Go to Noise Cancellation > Mode and select Manual Mode.

3) Drag the slider to set your preferred noise cancellation level.

3. It is recommended to switch from Noise Cancellation to Normal mode to verify whether the noise persists.

4. In Noise Cancellation mode, the earbuds capture ambient noise through the microphones and generate countering sound waves to cancel it out. This process requires real-time computation, during which the circuitry itself generates extremely low-amplitude electronic noise.

5. All electronic devices inherently produce some noise (such as humming sounds) during operation.This noise is barely perceptible but still present; individuals with highly sensitive hearing may detect it.

6. Try these earbuds with different audio inputs and Bluetooth devices (phones/tablets/etc.) to see if the issue persists.

Note: Noise cancellation might seem less effective in noisy environments.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.