SainSonic Zodiac GX-30 3D Glasses Active Shutter 144Hz Rechargeable for ALL DLP-Link Ready Projectors, BenQ, Optoma, Dell, Mitsubishi, Samsung, Acer, Vivitek, NEC, Sharp, ViewSonic, Black LATEST 144Hz Technology- It perfectly matches the 144Hz 3D DLP-Link projectors, also compatible with previous generation 96Hz 120Hz projection technology. Seamlessly Transmission- Data is sent in millisecond response time with no flickering. No emitter is required and the receiving distance is long with the maximum distance of 8 METER. Portable and Lightweight - The stable high quality LCD lenses will protect you from eyestrain, makes it very comfortable to wear even for a long time. Rechargeable Battery- It can be recharged with micro USB cable included. 3 hours recharging provides 50 hours operation, and 180 days under Sleep Mode. You need to recharge it every 1 or 2 months to prevent over discharge issue. Automatic Power Off- When the 3D projector is powered off or not synchronized with 3D signals, the 3D glasses will be powered off automatically after 30 seconds.