The Sena Technologies SMH10 is all you need to make your helmet complete. Make and receive phone calls, get turn by turn directions from your phone, talk with up to 4 of your fellow riders and crank up the volume with your favorite tunes!; ; 8 hours talk 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 to use 3 button system Individual volume control for each audio source