they write something about the impossibility of drawing a straight line . I will say this. Here is a plastic bottle in front of me. empty. I follow her. lo and behold, it works. moves the pointer, and for such a surface it is very even and smooth. Further. Laptop keyboard. I try right on it. You can even use it at work. It does not matter. Naturally, the key drop is felt by the pointer (the arrow on the screen). But not critical. Conclusion - the sensor is excellent, for which I love logitech. It does not work (at all) except on the screen of the phone and laptop. But the question is why do it. Why am I writing this. Before that, there was a logitech for quite a long time 185 chtoli, in general, an old one. everything suited. I decided to take an older model - they wrote reviews that I already began to think. In fact, everything turned out to be easier and better. For me it is definitely worth the money. (had experience in acquiring Chinese mice) Who cares about money - do not buy. But for me it definitely deserves its price. Would buy again - yes
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