Specifications: Display technology: LCoS, LED lens Lifespan: over 10,000 hours Screen: 4:3 Contrast ratio: 80:1 Projection distance: 21 to 180cm Projection image size (diagonal): 6 to 50 inches Standard screen resolution: 640 x 480 pixels Zoom and focus: manual Luminous flux: 12lm Input interface: by USB cable Power source: by USB cable Can connect with PC/laptop by USB port Built-in small fan.