As of writing this support article (March 2020), there are 3 models of AirPods.
- AirPods 1 (also known as AirPods with Charging Case)
- AirPods 2 (also known as AirPods with Wireless Charging Case)
- AirPods Pro
Only AirPods 2 and AirPods Pro are compatible with Wireless Charging.
If you are unsure which model of AirPods you have, please refer to this Apple support article.