Sena SF4 BT

For riders looking to communicate with their passenger, the SF2 provides simple Rider to Passenger 2-way intercom communication up to 800m (880 yards) in open terrain. This model lets riders enjoy smartphone connectivity. Riders can listen to music and use the intercom simultaneously using the Audio Overlay feature. Please note that Audio Overlay works best with Android devices, while iOS offers limited functionality. Bluetooth 4.1 Up to 4 way Intercom that extends up to 1.2km (.8 mile) (SF2 and SF4 Models ONLY) FM Radio, Radio sharing, audio overlay (SF2 and SF4 Models ONLY) Voice prompt Sena App for Smartphone