Bring all of the sound of your onboard audio system right into your helmet with the Sena 20S Helmet Clamp Kit. The adapter cable with multi-pin DIN plug connects the onboard audio system to the helmet clamp and allows users to listen to the onboard audio system| including FM radio and GPS navigation. The CB radio retains full functionality via use of the integrated PTT switch/button and clamp kit microphone. When paired up with a Sena 20S main module| all sounds - CB radio| GPS navigation| and FM radio - from the onboard audio system can be mixed with Sena 20S sound sources| including intercom| MP3 music| and phone. The 20S EVO Motorcycle Bluetooth Communication System represents a level of refinement from the proven market leader| the Sena 20S. An integrated shark fin antenna strengthens the signal within the specified 1.2 mile range to enhance intercom stability.