HDL-089 is a new product that is FM transmitter with Bluetooth car kit built-in.  It works not only as a car mp3 player（For use with flash disk, SD/MMC Card, MP3, CD and DVD players USB DONGLE, etc）, but also as mobile phone hands-free car kit.  When a call comes in or out, it will automatically change to phone dialog. After call ends, it returns to play music. It let you to drive more safe, more comfortably. When you play MP3/MP4 of mobile telephone, The singing will come from car stereo