3D Active Shutter Eyewear. Highly precise control completely closes the shutters for both eyes at the instant that the images change for the left and right eyes. This masks unwanted afterimages to enable clear and comfortable 3D viewing. The Eyewear can be easily adjusted to fit various face shapes and sizes, from children to adults, and their extremely durable hinges withstand repeated opening and closing. An Auto Power Off function automatically turns the glasses off if they are placed in a location outside the viewing range for 5 minutes, even if the TV remains turned on.