HTC 10 Sprint - Manual (Page 168)

Connectivity 155
Stream Music to Blackfire Compliant Speakers
Play music simultaneously to multiple Blackfire compliant speakers from your phone.
Before you start, make sure your speakers are connected to your Wi-Fi network. Refer to the
documentation that comes with your speakers to set up and connect them to your Wi-Fi network.
1. After connecting your speakers to your Wi-Fi network, open a music app on your phone.