Bluetooth MP3 Player, YOKKAO Car Charger FM Transmitter Receiver Radio Stereo Adapter Digital Wireless Handsfree Calling with Dual USB Charging Ports (5V/2A) for iPhone 6/ iPhone 6s MULTIFUNCTIONAL - Wireless Bluetooth FM Transmitter enables you to do hands-free calls, enjoy clear music, GPS voice navigation, charge your device. Better for empty channel. DUAL USB PORTS - Output voltage, DC 5V, 2A, with two USB ports, perfect for rapid-speed charging for any two devices in the same time. The USB sockets support U Disk to play music in your car speaker. EASY TO USE - Pair 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 ! DESIGH - Compact, lightweight and simple with built-in Microphone. ATTENTION - Please don't choose frequency that has local radio station to avoid interference