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 is the best long range Bluetooth headset. The unit also uses the Universal Intercom™ protocol so it can communicate with all Sena motorcycle Bluetooth headsets and non-Sena Bluetooth headsets on the market.