Portronics POR 318 is based on the DLP technology, which is the most sophisticated light technology in the world. It contains a rectangular array of up to 8.8 million hinge-mounted microscopic mirrors. Each of these micro-mirrors measures less than one-fifth the width of a human hair. The DLP chip can be used for efficiency and reliable spatial light modulation. Projector brightness is the most popular feature for any portable projector. The POR -318 is a 50 lumens projector and is great for 10-20 people in a reasonably dark room. The brightness remains the same whether it is connected to the AC Power or running on in-built battery. 80 inch diagonal screen length can be easily achieved by keeping the projector 8 feet away from the wall or the screen. One can enjoy movies through the SD card, USB drive or through your computer anytime and anywhere. The device is also useful for proffesionals on-the-go to present important presentations / slides and information to a group.