Feature: 1. COMPATIBILITY: 3D glasses are compatible with 96‑144HZ and support 3D projectors of major brands with DLP LINK technology (regardless of brand). 2. LONG BATTERY LIFE: DLP 3D glasses have a built in lithium rechargeable battery, which can last for about 30‑40 hours after 2‑3 hours of charging. 3. HIGH LIGHT TRANSMITTANCE: Rechargeable 3D glasses support one button left and right eye switching, high light transmittance, and excellent effects. 4. USB CHARGING: 3D active shutter glasses are USB rechargeable DLP LinK 3D glasses, which are very convenient to use. 5. CLEAR PICTURE: DLP Link 3D glasses enable clear picture rendering, effectively reduce ghosting, and present realistic 3D images. Specification: Item Type: 3D Glasses Material: Plastics, Electronics Model Working Mode: LCD Shutter Frequency: 148Hz Transmittance: 36% (TYP) Contrast Ratio: 1000/1 Standby Time: 180 Days Charging Time: 2.5 Hours Continuous Working Time: 35 Hours Signal Reception Distance: Approx. 6m/19.7ft Battery Type: Built In 45mAh Lithium Battery (Included). Package List: 1 x 3D Glasses1 x Eyeglass Cleaning Cloth1 x Charging Cable1 x Carrying Bag1 x Instruction Book