At the iPhone keynote Apple announced a feature with iOS 13 called Audio Sharing. It lets you pair two sets of AirPods or Powerbeats Pro to one iOS device. But more headphones will be supported (via Engadget).
Audio Sharing will be available to Apple headphones that have a W1 or H1 chip. This includes:
- Studio3 Wireless
- Powerbeats3 Wireless
- Solo3 Wireless
- Powerbeats Pro
The support will be added on September 23.