Description:
The VerticalMouse was found to be comfortable, easily adapted to, and promote a neutral wrist and forearm posture.

The patented shape supports your hand in a fully upright handshake position that eliminates forearm twisting.

The grip is the same as an ordinary mouse, just turned sideways into a handshake position. Many users said they got used to it very quickly.
 
The VerticalMouse does not move sideways when clicking with normal force because the thumb naturally opposes the fingers.
 
5 buttons are each programmable with different functions in different applications. For example, a button can be Double Click in one application and Ctrl in another application.

When the driver is not installed, the default functions in Windows are:
Top button - left click.
Wheel button - .middle click (e.g., for pan and rotate in CAD programs).
Middle button - right click.
Bottom button - back.
Thumb button - forward.