I use this camera class. It is easy and fast to install. The flexible shaft makes it easy to place on what you want to view and the focus is simply done with the small wheel at the goal. The resolution of the image is of good quality. It allows me to project the image of the book we are studying, to comment small animals (like cops and ladybugs, depending on the season), and children who say "I do not see ....". It's a good tool, I do not regret this purchase.