The MX Keys and MX Master 3S are advertised to be the perfect pair however I don't seem to see any functions tying them together. I purchased these two devices so that I could switch between a work pc and a personal PC that I use at the same time. It would be very nice if the mouse followed the keyboard when the keyboard switched to another device. I was previously using two different mice so I was hoping this new mouse was a better solution. However if I have to pick it up everytime I need to switch devices, that almost seems like more effort than just moving my hand to another mouse. Additionally if I only have 2 devices to switch between, it would be nice to "turn off" device 3 so I don't have to cycle through it on the mouse everytime I go from 2 to 1.