Featuresr wirelessly music playr play music in your smartphone or other audio device through your car39s fm stereo systemr hands free functionr allow hands free phone conversation through the car stereo and your phone39s microphoner stay chargedr the car charger with an extra usb port can charge any of your usb powered devices with maximum output of 24a while driving work with standard dc 12 24 v vehiclesr wide compatibilityr compatible with smartphones and other popular audio devic