about this project Bluetooth Hands-freeThis car bluetooth FM transmitter supports bluetooth hands-free calling, built-in microphone, safe to answer calls. Support A2DP functionThis bluetooth mp3 player supports mobile phone A2DP function, immediately play high-quality mobile phone music after connecting bluetooth. Support expansionThis car MP3 player supports memory card/U disk expansion to play MP3/WMA/WAV format. It comes with a car charger with an output of 5V/3.1A, which can be used to charge handheld terminal devices. Easy Installation Plug Just connect the bluetooth FM transmitter to your car cigarette lighter socket, connect the bluetooth, tune your FM to a fixed frequency. Easy to install and use, no pre-installed apps required. Professional ManufactureThis dual USB port car MP3 player complies with standard specifications, adheres to strict factory quality control, exquisite workmanship and reliable use.