Mvpower&reg;3-in-1 Wireless Hands-free Card Reader FM Transmitter MP3 Player Dual USB Port SD LCD Car Kit Charger for iPhone Support for hands-free telephone,convenient and safe on the phone. With multi-function remote control,Can realize number song selection and choose frequency. Support multipoint connections: can connect two phones at the same time. Built-in FM transmitter Support USB disk and Micro SD card, support TF card. Excellent voice quality, use the DSP (digital signal process) technology to echo cancellation With 3.5 mm line-in jack, support external audio devices. Switch to hands-free mode automatically from music playing status when receives an incoming call Dual 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