Best Wireless Multifunctional Bluetooth Handsfree Car Kit/Adapter FM Transmitter/Calling/MP3 Player, Dual USB Ports for Cellphones Power/Battery charge This is a new Bluetooth MP3 Player FM Transmitter Hands-free Car Kit Charger, which support USB driver card and can automatically play and transmit the MP3 files of USB driver after matched with your radio by the frequency. Simply paired your phone with the Bluetooth FM Transmitter and its hands-free system can set free your hands during answer the calls and let you safely drive. Excellent voice quality, use the DSP (digital signal process) technology for echo cancellation With this product, you can greatly enjoy the music and picking the call up, and have no need to worry about your mobile devices is lack of electric energy. It is perfectly suitable for the car owners. Moreover, this item has high-performance built-in microphone which can offer your clear talking and wonderful music, and it has two USB charging port to charge your portable devices.