just fitted a scala rider g4 communication
Just fitted a scala rider g4 unit from an older Arai to a new C3 and seems to work fine in communication with other G4 units.
Schuberth makes a real cool communication collar with the G4 built in but it is a bit pricey compared to the G4 as a stand alone or add on. If you have the $$ go with the collar. If you have a G4 in hand and are considering a Schuberth C3, it will work fine.