Function: can read U disk, mobile hard disk, HDMI connected to computer, AV connected to DVD, set-top box. Recommended projection distance: 1~3 meters Optical parameters: Technology Type: Monolithic LCD TechnologyPhysical resolution: 320*240Compatible maximum resolution: 1920*1080 HD 1080PBrightness: 30 lumensContrast: 500:1 (display ratio) Aspect ratio: 4:3 original, 16:9 compatibleDisplayable colors: full true color (1.67 million) Projection method: front, back, ceilingProjection Lens: Manual Focus Optical element: Projection size: 20-80 inchesProjection distance: 1M~3MBulb: 10W LED bulbLamp life: more than 20000 hoursVideo: * 1xAV input Output: Video:*1xAV*1xUSB*1xHDMI Audio: *1xAudeoData cable: three-color audio and video cableBe "Standard accessories: remote control, product manual