This is an active shutter 3D glasses, identify intelligently signals of all kinds of brands DLP technology projector, with the widest compatibility. Innovative and fashionable design and fabrication processing, eliminate electromagnetic interference, the latest flicker free shutter 3D technology, HD no flash no ghost shadow, can wear under most common glasses or glasses for the myopia. High quality liquid crystal lens provide high contrast, and clearness, brightness, and sharp 3D experience through lens. Auto power off function, the glasses will power off automatically to save power when there is no synchronizing signal. Signal will realize intelligent synchronization when power on, respond and show intelligently terminal operating frequency. Transmittance: 36% (TYP), field frequency: 120Hz, contrast ratio: 1000:1, charging time: 2.5 hours, stand-by time: 180 days, operating time: 20 hours, Bluetooth transmission characteristics receiving distance: 8M (max), receiving angle: up and down: ±35 degree, left and right: ±55 degree, temperature characteristic: operating temperature: 0~50 degree, storage temperature: -30~70 degree.