Nothing, it's a good set. Ergonomic, fits perfectly in the hand. Good pointing accuracy, works on almost any surface, no mat needed. I recommend to all. Pros below: - Consumes batteries economically - The kit is quite light - No need to take the mouse out of sleep mode for a long time, like some optical ones, i. E. reacts instantly in any case - Good mouse pointing accuracy - The mouse is not demanding on the surface, no mat is needed. In principle, it even works on glass. - The keyboard has many functional, customizable keys Some cons: - In devices there are batteries, not accumulators, respectively, and there is no charger. For such a price that I took at one time ~ 6000, We could supply batteries, albeit without a charger. - there is a useless window on the keyboard that shows the time and battery charge. But there are no "Num Lock", "Caps Lock", "Scroll Lock" lights. Instead, when you press the corresponding keys, a message pops up on the screen for a couple of seconds. It would be better if instead of time in the window of Claudia they were taken out. - Keys like "next track" only work with the active player, ie. a nning in the background will not respond to this. - Using the "Media Player" button, you can only install WMP, and in general the key settings are not very flexible. - Dynamic touch zoom bar hinders rather than helps, ie. don't put your hand in there.
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