? 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 Back" 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 nano USB receiver at the bottom of mouse, Just Plug and Play! ? WIDELY COMPATIBLE -- Widely compatible with Windows 2000 / XP / Vista / 7 / 8 / 10 / Linux. ?Note: Not compatible with Mac OS, Apple Products? Once you get used to the ergonomic mouse, you will love it so much ! ? GREAT CUSTOMER SERVICE -- Rest assured that all our LEKVEY ergonomic vertical mouse have unconditional 18-month product warranty ( Replace or Refund ) as well as lifetime easy-to-reach technical support