Passive 3D Glasses: The Sony passive 3D glasses (TDG-500P) are just like the ones you get at the movie theater, so they are very lightweight and comfortable to wear. The 3D image formatting is done solely on your compatible Sony 3D LED-LCD TV, so the 3D glasses are passive (no batteries required) and don't need to be synced, enabling you to enjoy 3D images anywhere in your room and free from the interference of other objects. The passive 3D glasses design also lets you enjoy 3D images from any viewing angle; whether you are sitting on the couch or laying on floor.