The Model 221 XS leads the industry with precise volume control for the left and right speakers. The microphone has a sensitivity control, on/off switch and a slim unobtrusive flexible microphone boom for positioning. Other features include a high frequency output for clear, crisp sound and small quick-disconnect plug fr easy detachment. For use in Full, Open Face & most Modular Helmets. Headset cord is included. 5pin din fits Honda, Suzuki, Yamaha, kawasaki, Harley (pre 1998).