Issue with sound
How to correct the rattling sound from one of the AirPods.
AirPods Pro
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Best reply
As described, the AirPod may have been damaged or is defective.
You would be best advised to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your AirPods. If one or other is defective, you’ll be able to explore your available options: