Both Boom 2 SE and Boom Plus speaker are support Partycast function, you can refer to the following steps to pair both speakers at the same time:

1. Turn on both speakers.

2. Press the PartyCast button on each speaker, and the indicator light will turn white.

3. You'll hear a prompt indicating successful pairing.

If you have additional questions, please contact us at service@soundcore.com for further assistance.