1Dual Car Charger: The bluetooth car adapter coming with 2 USB ports, you can charge two devices simultaneously. One universal USB charging port (5V/1A) also functions as a U disk port for play music. 2Hands Free Calling: Built in microphone, switch to hands free mode automatically from music playing status when receiving calls. Press only one button, you can take a hands free phone call easily and safely. 3Bluetooth 0: Support bluetooth 0, bluetooth radio transmitter provides a stronger signal and higher transmission, compatible with all bluetooth types and can avoid the problems of lost connection. 4Noise Cancellation: Noise cancellation technology and high performance microphones ensure nothing interrupts your calls by filtering out road and wind noise, make the call sound clearer. 5Music Playback: Support bluetooth music, U disk, TF card music playback. Plug and play, enjoy more high definition audio sources. With anti interference performance, you can listen to music while charging.