Product Description: GL1800 Projector 3D Glasses - Active Shutter, Rechargeable, DLP-Link Universal Compatibility: The GL1800 3D glasses are designed to support all DLP-LINK projectors, including popular brands like Optoma, Acer, BenQ, ViewSonic, Sharp, and Dell. This wide compatibility offers you a multitude of choices for an immersive 3D viewing experience. Advanced Optical Communication: These glasses utilize an optical communication method, allowing them to work seamlessly without the need for an external emitter. This feature simplifies setup and enhances portability, making them perfect for any environment. Long-lasting Battery Life: Enjoy up to 40 hours of continuous use on a full charge. The glasses are equipped with a low power alarm to alert you when it's time to recharge, ensuring you never miss a moment of your favorite 3D content. Intelligent Power Saving: To conserve energy, the glasses automatically enter standby mode just five seconds after losing signal. This smart feature helps extend battery life and ensures the glasses are ready when you need them. User-friendly Operation: The GL1800 glasses feature an LED indicator light that flickers to guide you through operations, making them easy to use. Additionally, they offer the flexibility to switch between left and right eye views, enhancing your 3D experience with customizable options.