3D Active shutter Rechargeable Glasses for DLP-link Projector * Universal Rechargeable 3D DLP-link Active Shutter Glasses * Battery 3.7V LI-CON Charge Time:2.5 H * L/R switch: Press the button shortly, you can switch the L/R sequence.Then you can get perfect quality images * Frames with ABS material, ultralight, make the comfortable experience of watching movie