The Evoluent™ VerticalMouse™ 3 is the advanced third generation of the revolutionary mouse that amazingly relieved wrist and arm pain (according to many user reports). The shape has been further refined in subtle details based on the ergonomic lessons learned from the previous two generations.
Eliminates Arm Twisting

The patented shape supports your hand in a relaxed handshake position that eliminates forearm twisting. You will quickly become accustomed to the improved comfort.

An ordinary horizontal mouse requires your forearm to twist away from its natural position.
Familiar grip

The grip is the same as an ordinary mouse, just turned sideways. 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. Pointer control is as accurate as any other good mouse when the pointer speed settings are properly adjusted.
Easy to use buttons
All 5 buttons are easily operable without contorting your fingers. The button force is light for easy clicking, but still firm enough to avoid accidental actuation.
Fits different size hands
The shape has been improved to fit larger hands as well as smaller hands.
Prevents desk rubbing
A small lip on the bottom edge prevents the little finger from rubbing the desk.
Ultra fast response
A 2200 dpi true optical resolution sensor moves the pointer quickly to reduce hand movements. The pointer can be moved across a 17" monitor with only 1/2" (13 mm) or less movement of the mouse. Most other mice have 400-800 dpi and require more hand movement.
Programmable buttons (XP Pro, XP Home, Vista 32)
5 buttons each programmable with different functions in different applications. For example, a button can be Double Click in one application and Ctrl in another application.
Special functions (XP Pro, XP Home, Vista 32)
Speed toggle - cycle among up to 3 pointer speed settings with a keyboard shortcut or mouse button. For example, a high speed for ordinary tasks, and a slow speed for graphics work.
Auto click - automatically perform a single or double click by pausing the pointer. Adjustable time delay for activation.
Click lock - press and hold a button momentarily to simulate continued pressing without holding down the button. Adjustable time delay for activation.
Break Reminder - visual and/or audio alerts to remind you to take a break.
Repositioning
The VerticalMouse 3 can be repositioned without moving the pointer:
Tilt it to the side to disable tracking.
Slide it without moving the pointer.
Compatibility
PC
Includes driver for Windows XP Pro and XP Home for programming all 5 buttons.
The driver is not required. The VerticalMouse 3 still has basic functionality without it.
Freeware driver for Windows Vista (32 and 64 bit), XP x64, 2003, and 2000 at www.highrez.co.uk/downloads/XMouseButtonControl.htm Although it is freeware,please make a donation to the author if you like it. (Evoluent has no business relationship with this vendor.)
USB only. Not compatible with PS2.
Mac
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1 button in OS 9 without a driver.
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5 buttons in OS X 10.4.5 without a driver: left click (top), right click (middle), expose' (bottom), show desktop (wheel), select window (thumb).
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www.usboverdrive.com sells a universal Mac driver that enables button programming.
(Evoluent has no business relationship with this vendor.)
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USB port.
Unix
Linux
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5 buttons in XFree 4.0.1 or higher and Knoppix Linux 3.9 or higher without a driver: left click (top), right click (middle), middle click (bottom), middle click (wheel), right click (thumb).
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USB port.