Specifically designed for Bell Qualifier and Mag-9 Helmets, the Sena Technologies SMH10 is all you need to make your helmet complete. Just pop that cover off on the side of your helmet and clip the SMH10 in place. Make and receive phone calls, get turn by turn directions from your phone, point things out to your fellow riders and crank up the volume with your favorite tunes!; ; Made specifically for Bell Mag-9 and Qualifier helmets 12 hours talk time, 10 days stand-by time Range up to 900 meters (980 yards) Pair up to 4 riders Turn by turn directions (when you pair with your phone's GPS) Music streaming Play, pause, track forward and track back your favorite tunes Easy operation by versatile Jog Dial Individual volume control for each audio source Single unit