Feature:1. [High Refresh Rate] This for dlp link 3D glasses use the latest active shutter technology, ultra fast 144Hz refresh rate, ahead of other 120Hz or 96Hz products level. Give you a better experience.2. [High Light Transmission Rate] Using less than 1.5ms response and light valve LCD lens, the light transmission rate is increased by 8 percent , high contrast ratio makes the picture appear clear, reduce ghosting, present lifelike 3D picture.3. [Long Battery Life] This active shutter 3D glasses built in 90mAh rechargeable polymer lithium battery, long battery life, durable and environmentally friendly, once filled for 40 hours of continuous playback.4. [Also Suitable For Nearsighted People] Our 3D active shutter glasses are designed for nearsighted people, they can be worn directly to watch 3D movies, and can be used with all kinds of nearsighted glasses on the market.5. [Wide And Fast Compatibility] The 3D glasses use for DLP Link as their synchronization method to quickly work with all for DLP Link technology projectors. (It is not compatible with TVs).Specification:Item Type: Active Shutter 3D GlassesMaterial: ABS, PCField Frequency: 96, 100, 120, 144HzStandby Time: 150 DaysAcceptance Distance: Approx. 8m or 26.2ftContrast Ratio: 1000:1200Light Transmission Rate: 38 percent 2Response Time: 2ms0.5ms (At Room Temperature)Charging Time: 2.5 HoursDuration: 40 HoursApplicable: For DLP LINK 3D ProjectorBuilt in Battery: Lithium Battery 90mah.Package List:1 xActive Shutter 3D Glasses1 x Charging Cable1 x Wiping Cloth1 x Storage Bag1 x Instruction Manual