Question about Logitech MK540 Advanced

We were not at all satisfied with the mouse/keyboard combination. There was a very large latency up to no reaction at all. I suspect that a USB receiver for 2 devices would only be OK at a maximum distance of 1 metre.
The keyboard was taken out of service and the mouse is now used as a single device.

Logitech keyboard K360, on the other hand, works wonderfully. It also has its own USB receiver - we use it together with the M185 mouse and are happy.