It is a MP3 player, FM transmitter and Car charger, one device combines three function 5 EQ option for MP3 music at Natural,Rock,Pop,Classic,Jazz, support USD disk, Micro SD card, AUX connection Wireless transmit phone call to car FM stereo system, capable for hands free phone calls, one click to answer/reject/redial calls USB charges for Iphone/Ipad and other mobile device through Dual USB outputs: 2.4mAh and 1mAh specific for Ipad and Iphone Infrared remote controller + Special Rotation button to operate music and phone calls