Roadmaster VR3 VRFM9BT Bluetooth FM Modulator FM transmitter modulates your audio files from your iPod, MP3 player, CD Player, DVD player or any other item that has a 2.5 mm headphone jack and allows you to hear your phone conversation hands-free Bluetooth button and built-in microphone USB and SD card slots for playing MP3 and WMA files from the SD Card or USB flash memory stick Auto reconnect just pair once 1.5 inch digital display