https://wccftech.com/how-to-factory-reset-airpods-tutorial/

Here’s a quick tutorial on how to factory reset AirPods (first and second-generation, both) in a few easy steps.

AirPods work flawlessly the moment you pair them with your iPhone, iPad or Mac. But there will come a point where you might want to revert back to factory state. Why? Because you’ve decided to sell your AirPods or planned to hand them down to someone else. If that is the case, then here’s how you can factory reset AirPods in no time.