There are various packages/combinations that work for various sports and activities.
This article will help when you are deciding what products to buy.
1) BBT Pro Main Units - You need TWO main units. One will pair to the other.Then you need the accessories for each of the main units.Some accessories might have to be bought together. See below.Example: The "Helmet" needs the "Helmet speakers with mic".Example: The "Headphones" needs the "Multi Connector".__________________________________WAKEBOARDING PACKAGEBBT Pro Units:For wakeboarder - Helmet & Speaker/MicFor boat driver or coach - Multi Connector + Headphones__________________________________KITEBOARDER TO KITEBOARDER PACKAGE (HELMETS)BBT Pro Units:Kiteboarder 1 - Helmet & Helmet Speakers with MicKiteboarder 2 - Helmet & Helmet Speakers with Mic__________________________________KITEBOARDER TO KITEBOARDER PACKAGE (SURF HATS)BBT Pro Main Unit - Pair (2 pcs):Kiteboarder 1 - Surf HatKiteboarder 1 - Surf Hat