A:Answer It only works through FM, as Its for cars that dont have a AUX or Line In, and/or bluetooth. If it sounds bad, first make sure antenna connections are all the way in and solid. then try lowering volume level on your phone. Mine sounded bad at 100% but great at about 80% volume. If still having trouble, change the braodcast frequency to a different channel, using the app. Or reading the manual. Mine sounds great through my FM, at about 80% volume on my phone.