The SENA Intercom Dual SF4 + HD Speakers is perfect for when you're on the road with friends. This four-way intercom system offers a remarkable range of over 1.2 km, ensuring seamless communication in open terrain. The SF4 can be paired with your smartphone to stream music, make or receive calls, and listen to navigation instructions. Thanks to the Audio Overlay™ feature, you can listen to music while using the intercom simultaneously. When connected to the Sena SF Utility App, you can configure device settings and view the quick start guide. Additionally, the intercom can also be connected to the Sena RideConnected App for near-unlimited communication range and interaction with an almost unlimited number of riders. Offering up to 13 hours of talk time, the SF4 fully charges in about 1.5 hours. Quick charging takes approximately 30 minutes and provides up to 4 hours of intercom time, making it an ideal choice for long rides.