The portable projector is quick to set up and is very flexible Suitable for use in darkened rooms. He need not necessarily an external power supply. Of course, using the power adapter, the picture is brighter. With a screen size of 50cm he brings a good contrast. For larger screens, the screen looks flat. By 60-120 lumens must not expect miracles. Tip: The exact focus of front / back of the projector slide is easier than with the wheel.