FM transmitter: Directly put the FM transmitter into the car cigarette lighter、 pair with your cellphone、then it can play music in your phone. Feel free to answer / hang up / reject a call (Frequencies:87.5-180MHz)Phone holder: 180 degree vertically rotation and with voice prompt function、 you can easily GPS when drivingCar charger: Comes with an extra USB port to charge your cell phones、 GPS and other digital devices while drivingWith the audio line、 you can connect the FM transmitter with MP3 or MP4. Plays audio files in MP3 and WMA formats in MP3 MP4 Player or USB driverRemote control: Conveniently to operate the FM transmitter with the remote controller; Automatic connection;Built-in speaker 2W power output; DSP technology;Full duplex、 noise and echo suppression.