Manufacturer: Logitech. The long battery life of the M505 virtually eliminates the hassle of changing batteries. The On/Off button saves power, while an indicator light eliminates surprises (Battery life may vary based on user and computing conditions). Laser precision means you’ll enjoy smoother tracking on just about any surface (The laser sensor does not work on glass or mirrors. If you’re looking for a mouse that will track on glass). With Logitech Advanced 2.4 GHz wireless you get the reliability of a cord with cordless convenience and freedom, fast data transmission and virtually no delays or dropouts. The tiny receiver stays in your notebook. Plus, you can easily add a compatible wireless mouse or keyboard without the hassle of multiple USB receivers. The sculpted, ambidextrous design, with soft rubber grips, feels good in either hand, even after long hours of use.