Bluetooth FM Transmitter with USB Port for Mobile Devices Wirelessly transmit phone calls from your smartphone through your vehicles FM stereo system. Can be used with non Bluetooth devices using the included auxiliary cable Play raw MP3 files by directly plugging in a SD card or USB drive. Includes a remote control to conveniently and safely switch between radio stations, navigate through MP3 files on a USB/SD card, next/previous track, volume up/down and more LCD screen with backlit display for easy viewing. Flex neck design for positioning in multiple viewing angles. 2.1A USB port allows you to charge while you play.