Acer X1328. Projector brightness: 4500 ANSI lumens, Projection technology: DLP, Projector native resolution: WUXGA (1920x1200). Light source type: Lamp, Service life of light source: 5000 h, Service life of light source (economic mode): 10000 h. Focus: Manual, Focal length range: 21.85 - 24 mm. Serial interface type: RS-232. Noise level: 27 dB, Projection modes: Ceiling, Front, Rear