The first purchase I go back to Amazon ...

I can not understand the positive comments written! I never returned an item purchased from Amazon for the disappointment to say the use of this presentation control. The black screen button does not work (even after several attempts contournelent via Windows language options, etc) the battery indicator displays a random state especially the use of the laser pointer. We can give the practical side of the passage remote slides but other products are also good for a much lower price than the R800. Time management can be optimized. In summary, I expect more from Logitech for this award and will fall back on a better quality / price product.