G3 DLP-Link 3D Glasses by Quantum 3D (4 Pack) Active Shutter DLP-Link 3D Glasses Liquid Crystal Active Shutters triggers 3D viewing in a full color spectrumenhances your 3D viewing experience with intense vivid colors (produces sharp clean colors that bests passive technology) Molded with a special plastic resin to allow for a smooth and silky like finishslip them on once and youll notice a huge difference between other 3D Glasses (comfortable enough to wear them for hours and the arms will not dig into hair or scalp) USB dust cover keeps dirt and grime out of USB plug innow you wont deal with dirt and dusty USB ports or deal with poor charges resulting from corroded or dirty contacts Illuminated power light keeps things simple. Easily tells you when the glasses are on, off, low on power, or fully charged. These glasses even have an auto-off feature, ensuring no battery power is ever wasted