Schuberth C4 with the SC1A integrated system works well. I’ve seen where the C4 doesn’t have the best reviews, but I’ve been happy with mine. Revzilla has had the C4 on sale for $349 since before Christmas. That is slightly over half off. SC1A is made by Sena. Pop in the SC1A cartridge on one side of the helmet and the battery on the other side and you are all set. Speakers, mic, fm antenna, and all wiring is pre-installed in the C4. Best of all, nothing protruding out the side of the helmet like most Bluetooth systems. You would never know that the helmet had Bluetooth installed looking at it.