Sena 50R Quick Start Manual page 13

QUICK START GUIDE
Open Mesh™
When Mesh Intercom is enabled, the headset will be in Open Mesh
(default: channel 1) initially. Users can freely communicate with each
other in the same Open Mesh channel.
Channel Setting (Default: channel 1)
If the Open Mesh communication experiences interference because
other groups are also using channel 1 (default), change the channel.
You can select from channels 1 to 9.