Bluetooth 4.1 Up to 4-way Intercom that extends up to 1.2km (.8 mile) (SF2 and SF4 Models ONLY) HD Speakers, FM Radio, radio sharing, audio overlay (SF2 and SF4 Models ONLY) Voice prompt Sena App for Smartphone Staying connected on the road has never been more seamless — and the SF1 Bluetooth Communication System is engineered to make communication effortless so you can keep your focus where it belongs: on the ride. Bluetooth 4.1. Up to 4-way Intercom that extends up to 1.2km (.8 mile) (SF2 and SF4 Models ONLY). HD Speakers, FM Radio, radio sharing, audio overlay (SF2 and SF4 Models ONLY). Voice prompt. Advanced Noise Control technology cuts through wind and road noise so every call and intercom conversation stays clear, whether you're cruising the highway or pushing through mountain twisties. At The Helmet Shop, Sena communication systems are our go-to recommendation for riders who want reliable, feature-rich connectivity. Backed by Sena's warranty. You may also like SENA SF2 Bluetooth Communication System CARDO FREECOM/SPIRIT 1/2 HELMT KIT SENA 10U Bluetooth Communication System w/Handlebar Remote
