Guarding your driving:Built-in Microphone，you can makes hands-free calls easy while driving.Enjoy your safety driving.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.Compatible for iPhone，for Samsung ，for Blackberry and for Android， for Blackberry & Windows SmartphoneDual USB Charging port:Output voltage，DC 5V，2A.You can charge your smartphone when you enjoy your driving.2 USB socket support U Disk to play music in your car speaker.Compact， lightweight and simple design - perfectly portable and unobtrusive