
I was looking for bluetooth, but the choice on the market turned out to be small and the prices were inadequate. I took to replace the K270, which served me 2 years without breakdowns. To be honest, I had to get used to it a bit, but the K270 is not bad either. It is not yet clear whether the K540 is better. Some pros: Convenient key layout, standard keyboard. There is nothing superfluous, all the keys are on the case. Comfortable to press. Logitech Unifying receiver support (devices that support this protocol can be connected to a common receiver, saving a USB slot). Got cons: After 2.5 months, the gap began to seize. Took it out, cleaned it up, seems to be fixed. Maybe I'm nitpicking, but the click is difficult and a little fuzzy. But with this, most likely, it is necessary to take mechanics, and not membrane. Expensive. After a couple of months, I began to notice how the buttons backlash and creak. Again, not much and quite tolerable.

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