The squeal only occurs when you have noise cancelling enabled.
All you have to do is cover the grill on the top and put your finger over the opening of the ear piece and you will hear the squeal.
Any movement of the AirPods in your ear will make a squeal sound.
All you have to do is cover the grill on the top and put your finger over the opening of the ear piece and you will hear the squeal.
Any movement of the AirPods in your ear will make a squeal sound.