In order to view 3D images and videos on the LIFEBOOK AH572 notebook, you need to use a special pair of circular polarizing 3D glasses. A pair of 3D glasses comes standard with the notebook; however, extra pairs can be purchased if you want to share the 3D experience with your friends and family or if you simply want a spare set of glasses. These glasses are ?passive? and do not require a battery for operation. As a result they are lightweight and flicker-free, without the need for periodic battery replacement. With these glasses, you can tilt your head without degrading the image quality, although the 3D visual experience may vary from viewer to viewer. A hard shell zippered carrying case is included along with a special nose piece that is provided for user comfort.