ERGONOMIC, SLEEK AND RECHARGEABLE DESIGN: Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. MULTIFUNCTION AND CONVENIENT: Advanced "Page Backward" and "Page Forward" functionality buttons provide convenience when web page browsing. 800 /1200/1600 DPI Levels -- Easily adjusts the sensitivity of the mouse. HIGH-CAPACITY RECHARGEABLE BATTERY: Built-in rechargeable battery. You no longer need to buy batteries, very convenient!! EASY TO USE: One USB receiver at the bottom of the mouse. Just Plug and Play! Take out the USB receiver from the slot at the bottom of the mouse, then insert the USB receiver into the computer, and then turn on the power switch at the bottom of the mouse to use the mouse, thank you. WIDELY COMPATIBLE: Widely compatible with Windows 2000 / XP / Vista / 7 / 8 / 10 / Linux and other OS. Once you get used to the ergonomic mouse, you will love it so much!