Outstanding Features Our 3d glasses adopts the newest active shutter technology, super fast 144Hz refresh rate, High definition, no ghosting images, no flickering, delivers a great 3D viewing experience for you Left/Right Eye Rotation If you have our 3D Active Glasses on and don't see the effect of 3D, just need to single clicking the "Power Button" again to flip the left and right eye views for synchronizing; very convenient, no need to operate the dlp projector. Long Lasting Battery The active 3d dlp glasses comes with built-in high capacity rechargeable battery, continuous working 45 hours after fully charged with USB , standby time 180 days; Auto 5 seconds Stand by and 5 minutes Shut Off, save energy andstable. Lightweight & Comfortable active shutter 3d glasses is lightweight and portable to take, also can be worn very comfortably in front of regular glasses, comfortable to wear for a long time ;