I've never had a need for such a device, but I worked for a company that wrote Skype for Business plug-ins, many of which revolved around "presence". You were considered active on your computer[0] when your mouse moved. We had a tool that we used for billing our time which included a graph of your Skype for Business presence state for the day you were entering time for[1].
I noticed, one week, that I was active 24-hours a day for three days in a row. I discovered that I left my mouse plugged in, it had fallen onto the carpet, and the minor vibrations that would occur in the house mixed with difficulty tracking would cause the mouse to move on its own "little enough" for me to not notice but frequently enough that it kept the computer from sleeping and kept my Skype for Business state bright green.
[0] Similar to Teams, today, you could be logged in from multiple devices; unlike Teams, a toast message might not reach your phone (or appear and be dismissed immediately) if you were active on a computer.
[1] This was entirely to assist in accurately filling out time sheets; it was never used to make sure "butts were in chairs".
The mousepad itself has an eink or similar display to change it over time and have the mouse detect some motion. The "active" part is turned off (to just be a regular display) when there is pressure on the wrist rest.
The mousepad is a USB hub (to get power for itself) that you can also plug the mouse and keyboard into so that its one less cord back to the computer.
If on Windows, I use their "Power Toys" (free, btw), which has a keep awake function. My company user policies do not allow me to manage my energy policy, which is what kept shutting off my screen (and therefore necessitating the complicated password). Power Toys solves this problem.
this usually keeps the laptop from going to lock screen
bonus: press B to blackout the screenshow to avoid monitor burn-in
[0] https://social.msdn.microsoft.com/Forums/office/en-US/c19a56...
