A device that moves an unattended mouse to prevent the computer from locking up after a period of non-use. A mouse jiggler is also used by remote users to fake working if their employers monitor their computer activity. See
telecommuting.
It Just Jiggles the Mouse
The Meatanty mouse mover simulates random movement of any wired or wireless optical mouse placed on top of it. The rotation frequency can also be adjusted. (Image courtesy of Meatanty.)