The appearance of innovative treatment process, to electromagnetic interference. The frame using ABS + PC material, low energy, low carbon and environmental protection. High permeability rate of perfect quality, no flash smelting, no blur. With auto Power-off function, stability, energy-efficient Low-power self-detected function, low battery LED flashes to prompt the user when battery is low. Item Type: Active DLP 3D Glasses for DLP 3D Projector UFO U30 U50 R19 R15 P12 Delivers a true 3D experience - For watching your favorite in a way. Don't support TV 3D Built-in high capacity rechargeable battery Auto power off function, energy efficiency. Rechargeable, Micro-USB, more convenient. User-friendly electronic circuit design, One single button, easy operation. Cool appearance, light design, comfortable to wear without dizziness. High-speed response of high-quality liquid crystal lenses, prevent from eye strain. colour:Black Material:plastic Package Contents: 4 x 3D Glasses 4 x USB Cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.