Add communication to your next bike ride with the Sena C1 fits Smart helmet Equipped with a made with Bluetooth technology communication system, complete with speakers and a microphone Whether you're looking to chat with another rider or simply listen to music on your ride, the C1 will take your ride to the next level Features built-in-4-way made with Bluetooth technology intercom, allowing for full-duplex communication between riders Pair your smartphone to the C1 to stream your favorite music, hear turn-by-turn GPS directions, cues from fitness apps, or take a phone call the C1 is also compatible with the convenient Sena Cycling App, which lets users adjust helmet settings, pair via fits Smart Intercom Pairing, or access the device's quick start guide on-the-go.