For wireless keyboards, they almost never indicate which version of BT is needed to work. At first I had an old 2.0 adapter, which simply refused to see the device. After replacing it with version 4.0, I found it and connected it without problems. Its pros: I have been using it for about a month without any problems, the non-standard arrangement of individual keys does not create any particular inconvenience. Has cons: I expected that the distance from the computer, where it would be possible to work with the keyboard without signal delays, would be more.
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