Specifications Brand BYINTEK Model GL1800 Product Name DLP Link Active Shutter 3D GlassesCompatibility DLP projectors UFO P19 P20 U30 U70 U50 U90 R17 R19 R20 Charge Time 2 3 hoursContinuous Use Up to 50 hours per chargeField Frequency 96Hz 144HzTransmittance 38 ± 2 Frame Material ABS PC compositeFeatures 1 Built in Rechargeable Battery High capacity battery supports extended 3D viewing sessions 2 Auto Power Off Function Energy efficient design activates sleep mode during inactivity 3 Simplified Single Button Control Easy operation for power and left right view switching 4 Lightweight Ergonomic Design Comfortable fit for prolonged use without dizziness 5 High Speed Liquid Crystal Lenses Minimizes eye strain with rapid response time 6 Electromagnetic Interference Reduction Innovative shielding ensures stable signal transmission 7 Low Battery LED Indicator Alerts users when charging is required Package Includes 1 x GL1800 3D Glasses1 x Charging Cable1 x Cleaning Cloth1 x User Manual1 x Protective Carrying CaseSteps for usage 1 Fully charged glasses2 Use the projector to play 3D film sources common 3D film source formats left and right format top and bottom format Blu ray 3D 2 Press the button on the 3D glasses once to turn on the 3D glasses 3 According to the angle of view of the movie press the button on the 3D glasses to switch the left and right angles of view each time you press it to switch