Actually, both keyboard and mouse are good, from an ergonomic point of view, there's nothing to complain about. Good with additional function buttons as well. The big problem is the receiver. It's purely unclean. Painful that a company like Logitech releases these in the market. In order for it to work optimally, the transmitter should preferably sit 10cm away from the keyboard and mouse, and without any obstacles, and it is usually common to sit so close. : /. It is sufficient to place a glass of water near the keyboard to interfere with the receiver. So the whole joke that it's wireless will disappear. And if you are still used to using it, it works well, though you can count on delays and that it loses contact occasionally. Pretty good product to exercise its patience.