Mouse Mover (Various Models)
The Mouse Mover allows an individual to control all mouse functions on both Windows and Macintosh computers using a combination of five single switches or any multiple switch.
Uses a 9-pin serial connection.
Mouse Mover USB
A switch input USB port that accepts single switch input via 6 switch input jacks on the front of the device, or 1 multiple switch input via 9-pin serial connection in the rear of the device.
These products are discontinued by the manufacturer, but they may still be available for purchase from third party vendors. Try searching the products by name on the internet. Be careful as the manufacturer may no longer support them - or support them for long.