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In order to watch 3DTV, you need to have 3D TV Glasses. The 3D Glasses purpose is to make sure that each eye is seeing the correct image. Having a different image being viewed by each eye is what creates the 3D effect. 3D TV glasses come in two types - active and passive.
Active 3D glasses sync electronically with the 3DTV, in order ensure that each eye is getting the correct image, and passive glasses simply use a coloured filter to filter out certain parts of the image to each eye, so that each sees something different, again creating the 3D effect.
The active glasses have a rechargeable battery built in, and you simply recharge them when necessary, while passive glasses have no need for batteries.