Sena SF2 Bluetooth Comm System Dual PackBuilt for communicating with another rider, the SF2 Bluetooth Communication System provides 2 way intercom communication up to 800 m (880 yards) in open terrain. The SF2 also lets riders enjoy smartphone connectivity allowing for music streaming, taking and making phone calls, and hearing turn by turn GPS directions. Plus, with the Audio Overlay feature, riders can simultaneously listen to music and use the intercom so you are never disconnected.