Logitech Anywhere Mouse MX, a wireless mouse that works along with small unifying receiver. Using 'Darkfield' laser sensor technology unlike other standard mouse that makes it work on almost every surface even glass (and no more bright red sensor light). Its using x2 AA battery that last almost as long as 100days, also works with only one battery without affecting its performance.It has adjustable wheel button for standard to super fast scrolling to suit such needs. Very nice design and finish. A big step forward for Logitech!