FM Transmitter, In-Car Universal Wireless FM Transmitter Radio Adapter Car Kit MP3 Player with 3.5mm Audio Plug and USB Car Charger [Supports MP3 WMA Music on SD Card & USB Flash Drive] ,Blue Double USB charging ports for charging iPod/iPhone, Samsung, iPad, Nokia and other mobile devices(Output 5V/2.1A). Support 12-24V voltage from the car cigarette lighter With compact portable design. Bluetooth hands-free function. LED Display the FM frequency/track Support multipoint connections: can connect two phones at the same time. Support USB disk and SD card (Up to 32G) Excellent voice quality, use the DSP (digital signal process) technology to echo cancellation. With 3.5 mm line-in jack, support external audio devices Compatible Modes: IPod/iPhone, Samsung, iPad, Nokia and other mobile devices