ERGONOMIC, SLEEK AND MORE COLOR DESIGN -- Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. If you want a ergonomic, colorful mouse, this could be your choice. Also, the various color option and the vertical design make it the best choice for home, office, libraries, dormitories, high-speed rail, air planes, or travelling use 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 ergonomic mouse. Also, the wireless vertical ergonomic mouse features a whisper-quiet click design for a better user experience, allowing you to stay focused on your work without worrying about disturbing others HIGH-CAPACITY RECHARGEABLE BATTERY -- The wireless ergonomic mouse built-in rechargeable battery. You no longer need to buy batteries, very convenient !! 3 hours charging can provide up to 150 hours of using. EASY TO USE -- One nano 2.4G USB receiver at the bottom of the vertical mouse, Just Plug and Play! WIDELY COMPATIBLE -- Lekvey ergonomic vertical mouse is widely compatible with Windows 2000 / XP / Vista / 7 / 8 / 10 / Linux, Mac OS【Note: The back/forward side buttons are not available for Mac OS, Apple Products】LIVE SMART, LIVE HEALTHY, RAISE YOUR HAND INTO COMFORT. Once you get used to the carpal tunnel mouse, you will love it so much ! AFTER-SALES CAREFREE, GREAT CUSTOMER SERVICE -- Rest assured that all our LEKVEY vertical ergonomic mouse have unconditional 24-month product warranty ( Replace or Refund ) as well as lifetime easy-to-reach technical support, please feel free to contact us via Amazon message or the service address on the manual. We are 110% committed to your satisfaction so you name it and we are on it