Universal Wired Hands Free Kit + Jack/RCA adapter Plug this hands free kot directly into your Smartphone and on your car audio system in order to enjoy your calls on your speakers. Hands free kit button integrated on the jack connector (call/end) This button also allows you to start and stop you music on your Smartphone Jack/RCA adapter provided to fit in all cars Warning : plug the jack with the button and the mike on your phone and not on your audio system.