Logitech M720 Mouse BT/USB 49$

Yes, you can use this mouse with three computers at same time, see the 1,2 and 3 buttons ? Neat!

LINK

Highlights
  • Pair M720 Triathlon with up to 3 computers and seamlessly switch between them at the touch of a button
  • Fly through documents and web pages, using the hyper-fast scroll wheel, or shift to click-to-click scrolling
  • A true athlete, M720 is designed to endure, with buttons, built to withstand multiple clicks
  • You’ll like this mouse’s boosted efficiency, with long time of power on a single battery
  • Unlock the full range of possibilities and customize to fit your needs