Got given one of these for Christmas. Very good product for the money, but don't expect everything. I'm not sure where it came from, but there was no installation manual (download from Maplin. Note the manual makes a cryptic reference to focus adjustment , but the lens is fixed focus which is fine. To preview the image you need to specify that in the program window otherwise you will see nothing. As with all videos if you wave the camera about you get a blur, and because the lens is a few feet from the handle it accentuates any movements, so care is needed to get a useful image otherwise even the video stills will be blurred. The focal length is from 6cm to infinity but don't expect to see something metres away inside a dark wall since the led light on the lens is naturally limited in brightness. Saving images is relatively easy, whether still (bmp) or video (avi) but a bit cryptic. Just to be clear, you do need to be attached to a PC to use it, so in practice a laptop is necessary. It comes with a clip-on magnet which rather to my surprise lifted a 5m steel measure. Field of view is maybe 30 degrees - at 25cm a hand will fill the frame.