

No idea. I usually use Solaar. And I’ve like 4 receivers laying around. I haven’t had any issues with that. The only issue I had in the past was that the keyboard would break connection at times (I also have K860), but I connected it with CPU’s Bluetooth connection, I think.
Which one? Please do share the link or name as well. My MX Master 2 died recently when I tried to replace its switches to make it silent. Right now, I’m using MX Master 3, but I find it less reliable than 2, so I’d love to hear about a budget mouse I can use that’s also ergonomic and similar to these mice.