For me this is the best mouse! I have been using it for the third year and all this time I have not changed the batteries. At first it seemed heavy if you use two batteries, but now, on the contrary, I like this "pleasant heaviness". But if it seems too heavy to someone, the mouse can work on one battery and is no different in weight from its counterparts. Almost all additional buttons are used and it is very convenient. In general, "Marathon" - and that says it all!
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