Do you want to enjoy music and hand-free calling on the go? You may need our in-car wireless FM transmitter to stream music from your smartphone, tablet, TF card, USB disk even MP3 or MP4 (via 3.5mm aux-in) to your car's stereo system. Built-in high-sensitive microphone with CVC noise cancellation for crystal hands-free call. Moreover, 5V/2.1A USB fast charge port always keeps your mobile devices fully charged. In a word, full of power and crystal stereo music makes your travel more enjoyable an