Bluetooth hands free cell phone kit, make hands free calls from your bluetooth enabled smartphone, led displays the exact frequency the transmitter is tuned to for easy syncing with your vehicles stereo system, wirelessly stream music from the digital fm transmitter to your vehicles fm stereo, charge your devices with the dual 2.4 + 1a usb ports on the 12v car charger & change music tracks forward, back play, pause answer & hang up the phone or voice controls like siri & google voice.