Scala Rider G9 motorcycle helmet intercoms
These things are The Bomb. My husband and I ride on separate bikes, but these work for folks who ride 2up also. They attach to half, 3/4, or full-face helmets and work with voice activation. You can also sync up your bluetooth phone, and with a cord, your ipod if you are so inclined to listen to music, personally I'm not into music while I ride. All is voice activated and hands free for safety. I don't know how we lived without these things before. I can tell hubby which way I want to turn or if my bike is making a funny noise. He can tell me I left my turn signal on again,or to pull off for some reason, etc. The new G9 version can also be quickly linked to up to 8 other headphones too for traveling with a larger group of bikes (hence the G9 designation, the previous G4 could only handle a group of 4 units). It also supposedly has a range over a mile. We travel in the mountains, and in the twisties with a lot of hills and trees I can testify that we haven't gotten out of range in almost half a mile of mountain and a ton of trees in between us. The voice detection works well and it adjusts to the ambient noise, turning up the volume of the speakers as needed to cover the noise of the wind and motor. They have a ton of features we haven't even tried yet. Check them out.