Acer PL6610T. Projector brightness: 5500 ANSI lumens, Projection technology: DLP, Projector native resolution: WUXGA (1920x1200). Light source type: Laser/LED hybrid, Service life of light source: 20000 h. Focal length range: 20.91 - 32.63 mm, Aperture range (F-F): 2.5 - 3.26, Zoom ratio: 1.61:1. Serial interface type: RS-232. Noise level: 31 dB, Noise level (economic mode): 28 dB, Projection modes: Ceiling, Front, Rear