Small groups connectivity & communication The SF4 is the perfect device for riding with friends by providing connectivity for small groups. The SF4 s 4-way intercom has a range over 1.2 kilometers (.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 & making phone calls, & hearing turn-by-turn GPS directions. Most importantly, riders can listen to music & use the intercom simultaneously, using the Audio Overlay™ feature. Plus, with the Quick Charging capabilities, you will be ready to start your ride in no time. Smartphone Apps keep you connected Link the Sena SF4 Bluetooth device to the Sena SF Utility App (available for iPhone & Android) to easily configure device settings & quickly access guides. The SF4 Bluetooth device also connects to the Sena Ride Connected App, which allows for communication with a virtually limitless amount of riders over an infinite range, so long...