Any unwanted noice is called feedback.  The two most common causes are fit and ear wax:
  • Fit - The in-ear receiver might not be deep enough in the ear canal, or the ear tip is not fitting snugly.  Adjust the position of the in-ear receiver or try the next larger size ear tip.
  • Ear Wax - Check that your ear is free of wax or wax buildup.
    • Use the device cleanign tool to remove wax buildup from the device or try a new ear tip.
For additon help, use the Feedback reduction toolin the Braun Clear App to help reduce the unwanted feedback.  This feature can be found in the more menuFeedback Reduction