Multifunctional Design 5 in 1:Wireless Bluetooth in-car Multifunction FM Transmitter enables you to do Hands-free calls?? enjoy clear music?? GPS voice navigation?? charge your device. Better for empty channel.</br>HOW TO ADJUST THE STATION: Long press the phone call button on this item to enter the selected frequency state?? then the digital frequency flashes?? shortly press "" key to achieve FM frequency in crease/decrease.</br>EASY TO USEpairing your phone and FM transmitter by bluetooth insert device in the socket switch to FM radio mode make sure FM transmitter frequency the same as car's FM then you can enjoy your music what you want</br>Dual USB Charging port:Output voltageDC 5V2.1A.You can charge your iphone/Ipad/tablet/and other smartphone when you enjoy your driving.2 USB socket support U Disk to play music in your car speaker.Compatible with iPhone 6 6+iPad Air iPad Mini 2 Samsung Galaxy S4/3 Samsung Galaxy Note 3/2 Nexus 5/4 HTC One Blackberry and Android Blackberry & Windows Smartphone.</br>Compact lightweight and simple design - perfectly portable and unobtrusive.</br></br>Product Description</br></br>Introduction <br> This product is UPGRADE blue-tooth car charger mp3 player for vehicle . Adapting professional-grade high-performance Bluetooth module built-in mp3/wma decoder chip make it capable of playing the music files in u diskfiring into the car stereo via wireless. Besides during the Bluetooth connecting play the phone's music and FM transmitter to Car Audio?? perfect ??as the calls incoming automatically switches to the speaker state?? call end then automatically back the music player. So you do not do any modifications?? easily enjoying the music and handsfree phone calls while you are driving. <br> <br> HOW TO ADJUST the Transmission Frequency: Hold the red/end call button?? when the number flashes proceed to change the station with the +/- buttons?? when you reached d