The VerticalMouse 4 is the next in Evoluent's series of ergonomic mice. 

An ordinary horizontal mouse requires your forearm to twist away from its natural position, which can cause painful injuries in the long term.

The VerticalMouse 4's design has been flipped sideways to encourage the hand into a handshake position, which avoids forearm twisting for better comfort and good health. Many users, including medical doctors, ergonomists and physical therapists have said the Evoluent VerticalMouse provides superior comfort and even relieved wrist pain.

Features: 

• Comfortable and easy to use. The shape is thoughtfully sculpted for uncompromised comfort and easy-to-reach programmable buttons. No finger contortions are needed to operate the buttons.
• Improved thumb rest -the thumb rest has been reshaped to provide even more comfort over earlier versions.
• Two thumb buttons - a new bottom thumb button provides greatly extended functionality when used with the included driver.
• An extra wide lip along the bottom edge prevents the last finger from rubbing the desk.
• Adjustable laser sensor -pointer speed controls on the side allow convenient adjustment without even releasing your grip from the mouse.
• Pointer speed indicators - top-mounted LEDs show through the chrome thumb rest to indicate selected pointer speed including extra low (XL), low (LO), MD (medium), to high (HI).
• Powerful and intuitive driver

Specifications: 

• Dimensions (L x W x H): 110 x 87 x 80 mm
• Connectivity: Wireless
• Compatibility: Windows XP, Vista, Win7, Mac OS X, Linux
• Warranty: 1 year