iSunnao Car Kit MP3 Player FM Transmitter - Streaming Music from USB/SD/3.5mm to Car Stereo System - with Remote Control and Car Charger iSunnao Car Kit MP3 Players streams music from 3.5mm audio devices, USB flash drives or SD/MMC Memeory cards to car stereo system via empty radio station. To avoid FM signal interference, it supports AUX port with 3.5mm audio cable from USB flash drives or SD/MMC memeory cards. Simply plug iSunnao Car Kit MP3 Player into the cigarette light port and tune to the empty radio station with the FM Requency Buttons (+ and -). You may also turn the volume up and down or power on/off withe the knob. With 360 degree rotation, it gives you ability to better position the MP3 Player in your car. The LCD display gives you the user friendly experience when operating the device.