The plug-and-forget nano-receiver is so small it stays in your USB port so you won?t lose it. If you do need to remove it, the receiver stores inside the mouse. With Logitech Advanced 2.4 GHz wireless, you get a reliable connection up to 20 meters away, with virtually no delays or dropouts, even in the busiest wireless environments. You can stay productive for 12 months without battery hassles. The On/Off switch helps conserve power, smart sleep mode extends battery life, and an indicator light eliminates surprises.* * Battery life may vary based on user and computing conditions. You?ll enjoy smooth, responsive laser tracking on just about any surface, easy text selection, and effortless scrolling that you just can?t get with a laptop touchpad.** ** Laser sensor does not work on mirrors or clear glass. It feels good in either hand?even after long hours of use?thanks to its hand-friendly, contoured design with soft rubber side grips.