Product Description 144 Hz 3D Active Rechargeable Shutter Glasses for DLP-link 3D projector (1) Universal 3D glasses, suitable for DLP LINK ready projector. (2) No emitter is required. (3) Light weight, convenient & comfortable wearing. (4)Brilliant design, anti-interference. (5) High quality chipset built in, provides fast working. (6) Excellent LCD lenses offer bright and sharp 3D experience. (7) With newest active shutter technology, high definition and no flickering. (8) Low-power alarm, auto power off function (9) Smart synchronization of working frequency. (10) Rechargeable