Which devices can be connected via Broadcast Audio on the Headphone (1) Pro?

Headphone (1) Pro supports Auracast™, working as both a transmitter and receiver.

As a transmitter:
Connect Headphone (1) Pro to your phone, computer, TV, or other audio source via Bluetooth to broadcast audio simultaneously to multiple nearby Auracast™-supported audio devices, such as headphones, earbuds, and speakers.
Your phone does not need to support Auracast™ broadcasting. Simply connect it to Headphone (1) Pro via Bluetooth to broadcast via Auracast™, regardless of the phone brand or model.
The receiving device must support Auracast™. Auracast™ support may vary across devices.

As a receiver:
Receive broadcast audio from Auracast™-supported devices from other brands.