Multi functional Design 5 in 1:Wireless Bluetooth in-car Multi function FM Transmitter enables you to do Hands-free calls, enjoy clear music, GPS voice navigation, charge your device. Better for empty channel. • 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. • EASY TO USE:pairing 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 • Dual USB Charging port:Output voltage,DC 5V,2.1A.You can charge your iPhone/I pad/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. • Compact, lightweight and simple design - perfectly portable and unobtrusive.