The SENA SF4 Motorcycle Bluetooth Communication System is the perfect device for riding with friends by providing connectivity for small groups.Bluetooth 4.1Smartphone app connectivityFour-way intercom for 1.2km / 0.8miFM Radio and Music SharingAdvanced Noise Control noise cancellationAudio overlayCE, FCC and IC certificationHD Voice enabled for high-quality phone call audioLithium Polymer BatteryQuick Clamp fitmentQuick charging in 1.5 hours for 13 hours talk time30mins of charge = 4 hours intercomThe SENA SF4 Motorcycle Bluetooth Communication System uses Bluetooth 4.1 to provide 4-way intercom has a range over 1.2 kilometres (.80 miles) so you can easily stay connected with your group in open terrain.The SF4 also uses smartphone connectivity, allowing for music streaming, taking and making phone calls, and hearing turn-by-turn GPS directions. Most importantly, riders can listen to music and use the intercom simultaneously, using the Audio Overlay feature.This system comes with a Lit