Acer M311. Projector brightness: 4500 ANSI lumens, Projector native resolution: WXGA (1280x800), Contrast ratio (typical): 20000:1. Light source type: LED, Lamp power: 220 W, Lamps quantity: 1 lamp(s). Focal length range: 21.85 - 24 mm, Aperture range (F-F): 2.41 - 2.53, Throw ratio: 1,54 a 1,72 (1524 mm@2000 mm). Analog signal format system: NTSC, PAL, SECAM. Wi-Fi standards: 802.11a, 802.11ad, 802.11b, Wi-Fi 5 (802.11ac)