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 mile (1.6 km) away, through the One Touch Group Intercom 10S also uses the Universal Intercom protocol so it can communicate with all Sena and non-Sena Bluetooth headsets on the market Advanced Noise Control that ensures ambient noise doesn't interfere with incoming and outgoing audio Bluetooth 4.1 technology, improved stereo Bluetooth speakers, and advanced architecture creates a smooth, crisp, and responsive user experience you'll love 10 preset station memory with automatic scan function Built-in FM radio with RDS AF (Radio Data System Alternate Frequencies) Talk time - up to 12 hours