Virtually silent The Logitech M220 Silent Wireless Mouse  is designed for near silent operation. With a 90% noise reduction, you can click away in the library, lecture hall or meeting without disturbing anybody. Its sound has been measured by an independent lab, & verified with by Quiet Mark  a seal of approval for its silent operation. Comfortable ambidextrous design The M220 Silent Plus  is designed for left & right hand use, offering comfort & precision for all. The compact size is ideal for popping in a bag to use on-the-go. Long battery life An AA battery provides up to 18 months of battery life for long-lasting reliability, so you can use it safe in the knowledge its battery won't run out anytime soon.