Black Menba Auto Charger Wireless In-Car Bluetooth FM Transmitter Radio Adapter With Single USB charging port PLAY MUSIC FROM YOUR PHONE & MAKE HANDS FREE CALL AUTOMATIC EXCELLENT SOUND QUALITY PLAY MUSIC FROM USB FLASH / TF CARDS UNIVERSAL USB CHARGING PORT Kindly Notice: This product has six channels, please make sure your car's radio can tune to at least 3 of these channels before purchasing. FM transmission frequency of 87.5 89.0 90.5 101.0 104.8 107.5.