Toshiba FPT-AG01U 3D Glasses, Black Technical Information - Glass Technology - Active Shutter; Lens Type - LCD; Application/Usage - Television; Features - LED Indicator; Battery Information - Maximum Battery Run Time - 75 Hour Battery Information - Battery Chemistry - Lithium Manganese Dioxide; Material - Resin; Color - Black; Height - 1.8"; Width - 7.1" Physical Characteristics - Weight (Approximate) - 2.08 oz Active shutter 3D glasses designed specifically for Toshiba 3D TVs Sturdy resin frame with liquid crystal glass lenses and wide design to accommodate glasses Active shutter opens/closes alternately with projected left/right eye images for 3D effect Uses an easily replaceable CR2032 3V "coin" battery for up to 75 hours of 3D entertainment LED feedback for on/off switch and auto power off to preserve batteries