The Penguin Ambidextrous Vertical Mouse 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 | Vertical alignment encourages a more ergonomic operating position | Prevents repetitive strain by enabling right and left hands to share the workload | BioCote Antimicrobial protection to inhibit growth of bacteria | Precision performance laser | Easy glide symmetrical base with precision laser and scroll wheel aids fast, accurate tracking and document scrolling | Central bow tie switch allows easy transition between right and left handed use | Adjustable 400, 600, 800 or 1200 dpi settings encourages fast and precise operating movements | Wireless mouse | Compatible with Linux, Windows 2000, XP, Vista, 7, 8, 10 and versions of these, MAC OS X 10.6 and above | BioCote keeps your Penguin Ambidextrous Vertical Mouse fresher and cleaner for longer, protecting against odour causing and staining microbes, such as bacteria and mold. BioCote has been proven to reduce bacteria/microbes on products by up to 99.5% in two hours OR 99.99% in 24hrs | | SIZE GUIDE: The Penguin mouse is available in three sizes. To choose the correct one for you, Measure your hand from the first crease on your wrist to the tip of your middle finger | SMALL: 0-160mm | MEDIUM: 160-180mm MEDIUM | LARGE: 180mm