Fully Sealed Dust-proof Design & Smart Touch ButtonsTR23 WiFi projector adopts a new generation of sealed opto-mechanical technology, which can prevent the formation of gray layer and the generation of black spots in the optical system, you can get rid of the trouble of black spots forever. And this projector using leading high-precision touch technology, precise touch, key lighting, easy operation in dark environments, while reducing key noise. Rich Colors, Restore The True Color of MoviesTR23 bluetooth projector uses German coating technology, through 5 production processes, to create an outstanding all-glass lens, with high light transmittance, high refractive index, low dispersion characteristics, much brighter and more colorful than other 1080p wifi bluetooth projectors, it will bring you a real visual feast. Ultra-fast 5G WiFi & 5.