Product Information: 
Car FM Transmitter/ MP3 Player
Dual USB Charger with 3.1A Output.
Bluetooth Handsfree Kit
Wireless Win mic
Version 4.2
 
Functions:
Support hands-free calling, built-in microphone, convenience, and safety for answering the phone.
Noise cancellation by CVC, wind noise suppression, full-duplex technology.
Auto pairing once turns it on.
Support MP3/ WMA/ FLAC from TF Card.
Will come with a car charger, and output 5V-2.1A can charge the device in the car.