Features 1、USB CHARGING: DLP LinK 3D glasses are USB charging type, just a data cable can give it a full charge, very convenient and fast. 2、LONG LIFE TIME: 3D active shutter glasses built in lithium rechargeable battery, charging 2‑3 hours can last about 30‑45 hours, long life time. 3、COMPATIBLE: 3D glasses 3D effect shocking, compatible with 96‑144Hz, support the major brands of DLP LINK technology 3D projector (regardless of brand). 4、LEFT AND RIGHT EYE SWITCHING: DLP 3D glasses support one button left and right eye switching, easy adjustment, high light transmission rate. 5、SMALL AND LIGHTWEIGHT: USB 3D glasses are small and light, so they are not too heavy when used and easy to store and carry when not worn. Specification Item Type: 3D Glasses Material: Plastic, Electronics Operating Mode: LCD Shutter Frequency: 96‑144Hz Transmittance: 36% (TYP) Contrast Ratio: 1000:1 Standby Time: 180 Days Charging Time: 2.5 Hours Continuous Working Time: 45 Hours Signal Reception Distance: Approx. 8m/26.2ft Battery Type: Built in 45mAh Lithium Battery (included) Package List 1 x 3D Glasses 1 x Glass Cleaning Cloth 1 x Charging Cable 1 x Instruction Manual