Feature: Compatible with iPhone 6/5/4、 iPad、 iPod、 Samsung Devices Play audio devices and smartphones through your car stereo system with 3.5 mm jack Comes with an extra USB port to charge your cell phones、 GPS and other digital devices while driving. Features a high-contrast、 easily-read display and prominent button controls Simply plug in your audio device through 3.5mm jack、 set a ramdon FM channel、 and tune the car FM audio to that channel.Package includes1 x FM transmitter1 x instructions manual