The four-way communication system is perfect for group rides with friends. With a range of over 1.2 km, it ensures seamless communication in open terrain. The SF4 communication system can be paired with a smartphone to stream music, make or receive calls, and hear GPS navigation instructions. Thanks to the Audio Overlay™ feature, you can listen to music and use the intercom simultaneously. When connected to the Sena SF Utility App, device settings can be configured and quick guides accessed. The communication system can also connect to the Sena RideConnected App, allowing communication with an almost unlimited number of riders over an unlimited range. The talk time extends up to 13 hours, and a full charge takes approximately 1.5 hours. Quick charging is completed in about 30 minutes, providing up to 4 hours of intercom time.