The Sena 10S Motorcycle Bluetooth Communication System is an upgraded version of the original SMH10 system| which has proven itself roadworthy to motorcyclists everywhere. Now in a slimmer profile| the 10S maximizes the enjoyment factor of your ride by keeping you in touch with up to four riding companions via crystal-clear HD audio| up to 1.6 km (1 mile) away| through the One Touch Group Intercom. The 10S also uses the Universal Intercom protocol so it can communicate with all Sena and non-Sena Bluetooth headsets on the market.