ELEPHAS 144Hz Rechargeable 3D Active Shutter Glasses Eyewear for All DLP-Link 3D Projectors-- Acer, ViewSonic, BenQ Vivitek, Optoma, Panasonic, Dell, Viewsonic etc Next generation super fast 144Hz refresh rate, ahead of other 120Hz or 96Hz product's level. Fashion desigh, beautiful color stands out among other dull black ones. Lightweight and portable to take, comfortable for long time wearing. 178 wide viewing angle enables you to watch large screen movies without distortion, providing you a superior 3D visual experience. Built-in high capacity rechargeable batteries allows you playing up to 30 hours continuously. Indicator Light for showing Battery status. Easy Operation: Simple One Button Operation with Auto 5 seconds Stand by and 5 minutes Shut Off, detailed user manual included.