iManson FM Transmitter Wireless Bluetooth Handsfree Car Kit Adapter with USB Port charger Music Control Card Reader for Cellphones Power Charging iPhone Samsung and More Bluetooth Smartphone Convenient: This product is dual USB output. You can charge two devices at the same time . Multifunctional:Built-in mp3/wma decoder chip make it capable of playing the music files in u disk,firing into the car stereo via wireless. Support power off memory-automatically recover the ex-time frequency and song playing information. Bluetooth handsfree:paired with phone,then could reach BT handsfree,safely driving. Dual USB Charging Port: 2 Port is ok for charge and music play at the same time.