Features:

• Naturally Comfortable: the vertical alignment encourages a more ergonomic operating position.
• Ambidextrous Design: Central 'bow-tie' switch allows for easy transition between right and left handed use.
• Easy-glide symmetrical base allows the user to rest either hand comfortably alongside the vertical structure, encouraging the use of the larger muscles in the fore and upper arm to maneuver the mouse with precision finer movements performed by the hand and finger muscles.
• Precision performance laser: Provides accurate tracking on typical work surfaces.
• Performance laser tracking with variable DPI settings (400, 600, 800, 1600) allows flexibility for different types of applications
• Easy and precise scroll wheel for fast and accurate document scrolling; also includes auto-scroll feature

•  Plug & Play USB 2.0 - Windows XP, Windows 2000, Windows Vista, Windows 7, Windows 8, Windows 10, Mac OS X, Linux

• Available in three sizes in wired and wireless - measure you hand from the first crease on your wrist to the top of your middle finger

• Small: 6" or less (16 cm or less)
• Medium: 6" to 7" (16 cm to 18 cm)
• Large: 7" or more (18 cm or more)
  

The Penguin marks a major breakthrough in the battle to beat health problems created when computer users spend too much time handling a conventional mouse. It sets new standards of protection against a range of upper limb conditions such as repetitive strain injury (RSI) and carpal tunnel syndrome (CTS) by enabling right and left hands to share the workload and avoiding exaggerated movements of the wrist joint that can increase pressure on the soft tissues in the carpal tunnel. Regular switching of hands throughout the day helps prevent static muscle strain (SMS) in the arm and shoulder - a major source of discomfort in mouse work.