Works out of the box on a corporate locked-down laptop (Windows 7) that does allow external mice. Zero configuration. What it does is move the mouse a few pixels every minute or so and keeps our screensaver from activating. You have to look carefully to see that it is doing its thing, since the effect is subtle.
https://www.amazon.com/CRU-30200-0100-0011-WiebeTech-Mouse-Jiggler/dp/B000O3S0PK

