One of my best presenter I have purchased so far. The last was a R 400, so far I was happy with it, only the red LED laser was too weak in many applications. The green lasers on the other hand is a stunner. It even works with transparent walls Presentation (Beamer lit from behind) and even with large LCD screens. Unfortunately, in the package only the manual in English and Chinese from the R 400 was inserted and not the R 800. The R 800 but has 2 additional keys on the right side, so I had to play times what they are first. For the price one should have expected that the correct operating instructions is with settled. Therefore only 4 stars.