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The Acer X139 is a high-brightness DLP projector with 5000 ANSI lumens and WXGA resolution (1280x800). It features a lamp light source with 5000 hours in standard mode and 15,000 hours in eco mode. The lens offers a focal range of 21.85-24 mm, an F-number of 2.41-2.51, and a 2:1 zoom ratio. Equipped with RS-232 and HDMI 1.4a (full-size) ports. Noise levels are 32 dB normally and 27 dB in eco mode. Supports ceiling, front, and rear projection.