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.Connects To Onboard Audio System With The Included Multi-pin Adapter Cable Offers Full Onboard Audio Functionality Directly Into Helmet Fully Compatible With Sena 30k, 20s And 20s Evo Modules (sold Separately) Includes Earbud Port Imported