QR Code Link to This Post Used 20S Bluetooth unit. The Sena 20S features a staggering 1.5 mile range, advanced Bluetooth 4.1 and built-in FM radio tuner. Stay connected by calling hands-free, enjoy music, listen to voice instruction from your GPS navigators wirelessly, all while having conversations in full duplex with a passenger or other riders. This unit comes with two mounts and various mics and booms for two helmets. Full face, modular, half face... I have the mount for you. Let's block ads! (Why?)