The MPro120 is 3M's second-generation pico projector and it's a distinct improvement over the MPro110, with a brighter picture, an LED light source rated at 20,000 hours instead of 10,000, and built-in half-watt speakers.
In case you don't know what a pico projector is, as its name implies, it's a miniature handheld projector that's capable of casting a big image (3M says the MPro120 can project an image from 8 inches to 50 inches). The key to these pint-size projectors is they use an LED light source that's very energy efficient. While Pico projectors come in different shapes and sizes, most cost between $300 and $400, and currently sport resolutions up to 640x480 pixels (so we're not talking high-definition). The MPro120 uses LCoS (Liquid Crystal on Silicon) display technology; others use DLP. These are the same main technologies employed in rear-projection TVs, but projected on an external wall, movie theater-style, instead of the backside of a TV screen.
We liked the look and feel of the all-black MPro120 and found it simple to set up and use. Weighing 5.6 ounces and measuring 4.5 inches by 2 inches by 0.9 inch, it does indeed fit in a pocket (or easily slip in a laptop bag) and comes with a protective sleeve. You can prop the projector up at angle by flipping open the integrated flip stand (it's just a thin piece of plastic), or you can attach the included tripod to the threaded tripod mount on the bottom of the projector.
Out of the box, the easiest way to set up the projector is by connecting it to your laptop with the supplied computer connector or to a portable DVD player with the supplied composite AV cable (also referred to as an RCA adapter). The MPro 120 also includes a rechargeable battery. Its rated life is 4 hours, but that's at the lower brightness setting, which was really too dim. At the higher brightness setting, we got 2 hours. Fortunately, it can also work under AC power as well using the included wall charger.
Using your computer, you can then project a PowerPoint presentation on the wall, and so long as you didn't project the image too big (more than 26 inches or so), you'll get a passable image, though these types of projectors simply can't compete with full-size projectors that offer significantly brighter illumination and higher resolutions. Go any bigger and you really need the room to be dark and even then you're just not going to get the kind of brightness or sharpness you're used to with your laptop screen or traditional portable projectors.