different colors indicate what (AirPod pros)
What does the different colors mean on the front led indicator?
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If your AirPods are in your case and the lid is open, then the light shows the charge status of your AirPods. When your AirPods aren't in your case, the light shows the status of your case. Green means fully charged, and amber means less than one full charge remains.
See the following link: Charge your AirPods and learn about battery life - Apple Support