If the active noise cancellation (ANC) performance isn't working as expected on your earphones, a buzzing sound can be heard from your earphones after ANC is enabled, or you feel that noise cancellation effects in the left and right earphones are inconsistent, perform the following steps:

1. ANC works well for low-frequency noises, such as the noise on airplanes, trains, and in offices (air conditioners), and isn't designed to reduce high-frequency noises, such as background voices, whose frequency range typically exceeds the ANC range. Therefore, background chatter can only be partially eliminated.
2. Adjust the way that you are wearing the earphones, as the volume level can be affected by wearing posture, fit, and the difference in environmental noise received by the left and right ears.Select a pair of ear tips that best fits your ears and adjust the position of the earphones to ensure a snug, comfortable fit.
    

   • If you are using WATCH Buds, click here to read the guide, for tips on optimal wearing and listening.
   • If you are using FreeBuds Studio, adjust the width and ear cups to create a snug fit on your ears, for optimal sound quality and noise cancellation.
3. To maintain excellent performance, it is recommended that you clean the earphones once a week using a clean and dry cotton swab with a pointed tip to gently wipe and clean the mic and speaker mesh, and then use a soft cloth to clean the mesh. This prevents influence on noise cancellation performance from foreign objects on the mesh.

   

4. Update the earphones' software to the latest version, by referring to the update guide for the earphones' firmware.
5. Enable noise cancellation: Select Noise cancelling. A tone will play once the noise cancellation mode is set.
   • FreeBuds Pro 3/FreeBuds Pro 2/FreeBuds 5i/FreeBuds Pro/FreeBuds Studio/FreeLace Pro: Enable Ultra mode in the AI Life app when in a noisy environment, such as on the metro.
   • FreeBuds 5/FreeBuds Lipstick/FreeBuds 4/FreeBuds 3, or other open-fit ANC earphones: These open-fit earphones are designed for comfort and the noise cancellation may be inferior to in-ear earphones. You can try different noise cancellation modes in the AI Life app before selecting the best option.
   • WATCH Buds: You can enable or disable the noise cancellation feature in the Huawei Health app.
    

   • FreeBuds 4i/FreeBuds 3i/FlyPods 3 doesn't support noise cancellation modes, such as General, Cosy, and Ultra.
   • FreeBuds 4/FreeBuds 5 doesn't support Ultra mode.

Make sure that the earphones' firmware is updated to its latest version. If the issue persists, take your device and proof of purchase to an authorised Huawei Customer Service Centre for assistance.