Viewsonic PJ551D. Projector brightness: 2200 ANSI lumens, Aspect ratio: 4:3, 16:9, Projection technology: DLP. Service life of lamp: 3500 h, Lamp power: 180 W. Focus: Manual, Focal length range (f-f): 21.95 - 24.18 mm. Vertical scan range: 50 - 85 Hz, Horizontal scan range: 31 - 79 kHz. Analog signal format system: NTSC 4.43, NTSC M, SECAM