Review on 🐭 Evoluent VMDMW VerticalMouse D: Wireless Ergonomic Mouse for Right-Handed Users - Original VerticalMouse Brand (2002) by Bryan Reed

The pointer was everywhere. I can't get it no matter how hard I try. What also seemed strange was the location of the IR sensor, not where it naturally appears. It looked more like a palm than fingers. Also, 3 buttons seemed difficult to control since on a standard mouse the middle button is where the right button is. You'll either have to move your finger and relearn how to press, or remap the keys.