Play movies music and photos stored on a USB memory card SD card or DVD. Media player is docked to the docking station in the front seat head restraint for easy installation and removal. Sold as single media player. Two media players are recommended for more than one passenger in the rear seats. Can be used outside of the car by removing it from the docking station and plugging in the included power adapter. Includes remote control wireless headphones docking station and external power supply. No internet connection required.