What is the opinion of Reddit about the
TRENDnet 2-Port USB KVM Switch and Cable Kit with Audio, Manage Two PCs, USB 1.1, Hot-Plug, Auto-Scan, Hot-Keys, Windows & Linux Compliant, TK-209K?

I use this one with a Windows 10 computer and another PC using Fedora:
https://www.amazon.com/TRENDnet-2-Port-Switch-Cable-TK-209K/dp/B000L4D42Q/ref=sr_1_3?ie=UTF8&qid=1500988191&sr=8-3&keywords=trendnet+2-port+usb+kvm+switch

I only use it for the KB and mouse, not video, but it has worked fine.

No, doesn’t exist in a wireless form. The closest thing I can think of is a KVM Switch.

However, what do you need a mouse for? If you tell me what you are trying to do with that mouse, and what OS you use, I might have a better idea.