I also have a K400 keyboard with trackpad. I like the smallish size. I never use the numpad part so having a trackpad there works for me. It gets moved from device to device some times. My headless raspberry Pi setups mostly. K350 on my main desktop. I like the padded palm rest on it. Relinked it to my Trackball's Unifying receiver an gave the mouse that came with it to my father.
I have a fold up Dell mouse (that apparently came with or designed for a laptop) and it unfolds to something similar to the Arc Mouse. Dell sent this to me in a "Christmas package" that was sent to those of us that are regulars on the Dell forums ("rockstars" - the rock in reference to Round Rock Tx where Dell HQ is).
Just dug up another nice surprise for the MX Master:
In Chrome, you can't 'wheel-click' a bookmark to open in a new Tab and have it switch to it immediately without holding Shift;
... until now!!!
Doesn't work with Edge though! Go figure!
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