UST ALR P (Ultra short throw Ambient Light Rejecting-BLACK BORDER With Sound Perforated AcousticTransparent)Material; 「ALR/CLR;Black/White Lenticular Technology」 Excellent Ambient(Ceiling) Light Rejecting Function; The screen's bottom black border with a Perforated Acoustic aperture of 0.4mm for design Anti "blocking feeling”，3D stereo surround sound is realized. Matched UST laser projector and Protect eyesight 「Real lumen of 1800ANSI or more」 Motorized rising/ pop-up/roll up/rollable screen system 0.6 Gain，170° angle of view，3D 4K/8K HD Visual Feast Perfect Visuals – Whether the ceiling Light On Or Off 4 control methods to achieve PoP-Up About 20-30 Seconds！ Matched UST laser projector and Protected eyesight Tab-Tensioned Rope Design-Screen Smooth As A Mirror Plug & Play, Fast easy to Set UP, No Drilling Required install，Space-saving design Note: Due to changes in ambient temperature and humidity, the screen may develop slight wrinkles. This is a normal phenomenon and does not affect the actual viewing experience. As for the voltage, we can provide 110V and 220V. If you have special or two kinds of voltage locally, please note your voltage requirements when placing the order.