MOACC Newest Economical UNIVERSAL 3D Active Rechargeable Shutter Glasses for Mitsubishi, Samsung, Acer, BenQ, Optoma, Dell, Vivitek, NEC, Sharp, ViewSonic DLP Link /DLP-Link Projector and 3D Ready DLP HDTV-Black Fashion Design: Beautiful color, portable and comfortable. Light weight for long time wearing. Upgrade function: Press the power button one time to turn on/off glasses. Press the power button two time to change the left lens and right lens. Green consumption: Recharge with micro USB cable 3 hours recharging provides 50 hours operation. Automatic POWER OFF function: When 3D projector is powered off or not synchronized with 3D signal,3D glasses will be AUTO powered off after 31 seconds.