Setup button on the AirPods and AirPods Pro charging case

The setup button in the center of the back of the AirPods 1 and 2 charging case.

The back of the AirPods 1 and 2 charging case

The setup button in the center of the back of the AirPods 3 charging case.

The back of the AirPods 3 charging case

The setup button in the center of the back of the AirPods Pro charging case.

The back of the AirPods Pro charging case