Want to enjoy stereo music and hand-free calling on the go? You may need an in-car wireless FM transmitter to stream music from your smartphone, tablet, TF card, even USB disk to the car stereo system. Built-in high-sensitive microphone with CVC noise cancellation for crystal clear hands-free calls to ensure safe driving when answers incoming call. Moreover, 5V/3.4A Dual USB fast charge ports always keep your mobile devices fully charged. In a word, full of power and crystal stereo music makes y