Item Type: 3D GlassesMaterial: Plastics, ElectronicsModel Working Mode: LCD ShutterFrequency: 148HzTransmittance: 36% (TYP)Contrast Ratio: 1000/1Standby Time: 180 DaysCharging Time: 2.5 HoursContinuous Working Time: 35 HoursSignal Reception Distance: Approx. 6m/19.7ftBattery Type: Built In 45mAh Lithium Battery (Included)Package List1 x 3D Glasses1 x Eyeglass Cleaning Cloth1 x Charging Cable1 x Carrying Bag1 x Instruction Book1COMPATIBILITY: 3D glasses are compatible with 96144HZ and support 3D projectors of major brands with DLP LINK technology (regardless of brand). 2LONG BATTERY LIFE: DLP 3D glasses have a built in lithium rechargeable battery, which can last for about 3040 hours after 23 hours of charging. 3HIGH LIGHT TRANSMITTANCE: Rechargeable 3D glasses support one button left and right eye switching, high light transmittance, and excellent effects. 4USB CHARGING: 3D active shutter glasses are USB rechargeable DLP LinK 3D glasses, which are very convenient to use. 5CLEAR PICTURE: DLP Link 3D glasses enable clear picture rendering, effectively reduce ghosting, and present realistic 3D images.