So each eye sees a slightly different image, producing the 3-D effect.

VOA: special.2010.01.26

A signal from the TV tells each side of the glasses when to turn on and off, showing each eye slightly different images that create the sense of depth.

VOA: special.2010.01.26

They can choose different skin colors,hair styles, eye and mouth shapes.

VOA: special.2010.06.04