Ivation Bluetooth FM Transmitter, Enables You to Connect Your Phone to Your Car Stereo, Hands-Free Kit w/Hands-Free Calling, Music Control, Car Charger for iPhone, Galaxy, Smart Phones, Tablet, iPod Pairs Your Device iPhone Tablet Smartphones To Car Speakers Crystal-Clear Music & Audio Streamed Over FM Radio Channel of Choice USB Port Eliminates Need for Additional Mobile Charger Built-In Battery for use When Disconnected from Cars Power Source