Size: 49-130 inch (Min-Max); 50-inch image is recommended for normal light environments (i.e. small office / classroom presentations?? anywhere gaming/entertainment?? travel). 100-inch image is generally recommended for low light environments (i.e. home theater?? man cave?? garage cave?? camping?? outdoor movie night).</br>Native Resolution: 800x480; Supports 1080p?? 720p?? 1080i HD resolutions; Contrast Ratio: 1000:1; Brightness: 1200 lumens</br>Multifunction Interfaces USB/AV/SD/HDMI?? 50W Low Power Cost. As for connecting iPhone/iPad/Android Smartphones?? the projector supports MHL Input; you need to order the MHL CABLE LOCALLY. 5V Output USB for Mobile Tablet power supply. This means the USB output is only for power supply. (NOT FOR iPhone?? iPad charging)</br>Not recommended for PPT or business or teaching presentation?? need to use in dark environment.</br></br>Product Description</br></br><p><b>Technical Specification:</b> <br> Imaging Technology: TFT LCD <br> Brightness: 1000 Lumens (Int