If you are traveling with your family on a long trip, you can entertain them with installing the 17-Inch roof monitor in your car. Using this device is easy, as simple as just plug it to DVD player USB port or play the movie via an SD card. While the sound can be transmitted to the speakers using the built-in FM Transmitter.
If you want to enjoy the movie privately you can use the built-in speakers or connect to wireless headphone via IR. This 17-Inch roof monitor powered by your car battery, so you don’t have to worry about the battery life. It also can be used to play MP4, MP3, WMA audio files, NES game files, and browse pictures.
If you need one for your car, you can buy it from ChinaVasion for $291 each unit.