Ya if you don't have a cb then you should have gotten just a SM10.
It is set up to pair to two headsets an at the same time
This way both headsets can talk to each other and listen to the same music
that is playing through the SM10.
I use one connected to the headset jack so any source on bike can be used along with my GPS.
Think they run about 125 bucks. Cheaper because they only transmit one way not like the Freewire
that is used so you can transmit over your CB
All this is true if you are using something like a Sena 20s on both helmets