Ergonomic Design: A well-designed and contoured mouse body supports your palm and cradles your thumb and finger. The ergonomic design allows smoother movement and prevents wrist strain caused by traditional mice High Responsiveness: Simply press the DPI button and switch between DPI levels 800, 1200 and 1600 to adjust the mouse's responsiveness to suit whatever you're doing. Optical Tracking Technology ensures greater sensitivity for precise tracking on a wide range of surfaces Usb Charging Built with High capacity battery , you can easily charge the vertical mouse with the micro USB cable anywhere, no bother of replacing the batteries. When battery power is low, the power red indicator light will flash; while charging, the power indicator light turns blue and it will turn off after fully charged. Stable Wireless Transmission Technology: 2.4GHz wireless technology can provide a reliable connection and not be subject to any interference in the 360 degrees within 10 meters. Enjoy the fast data transmission at the convenience of the wireless technology Wide Compatibility: Compatible with most system including Windows 2000 / ME / XP / Vista / 7 / 8 / 10 / Mac /Linux etc?Not fully compatible with Mac OS system, forward/backward side button not function on Mac? Specifications: Size:4.1*2.7*2.3 inches Weight:140 g Material: plastic Engine: Optical Resolution: 800-1200-1600DPI System supported: Windows series/Mac/Linux Power supply: Built-in 3.7 V 500mA lithium battery What You Get 1 x Wireless Ergonomic Mouse 1 x USB charging Cable 1 x USB Receiver (The usb receiver for the mouse is in a small transparent bag inside the box, thanks! !)GREAT CUSTOMER SERVICE -- Rest assured that all ourergonomic vertical mouse have unconditional 12-month product warranty ( Replace or Refund ) as well as lifetime easy-to-reach technical support.If you have any questions about the mouse, please contact us, we will try our best to serve you, thank you. Wide Compatibility: Compatible with most system including Windows 7 / 8 /10, XP, Vista, Mac OS X 10.10 or higher version, Linux. Works with Notebook, PC, laptop, computer by just plug in the USB receiver(The usb receiver for the mouse is in a small transparent bag inside the box, thanks! !). Multifunction: Adjust DPI level 800/1200/1600 to change cursor sensitivity, meet both ordinary and gaming need. Forward/Backward side button for easy web page browsing, ?NOTE: When using the mouse with Mac, forward/backward button browsing buttons will not function, but other buttons are OK.?. HIGH-CAPACITY RECHARGEABLE BATTERY: Built-in rechargeable battery. You no longer need to buy batteries, durable and Eco-friendly, very convenient !! EASY TO USE -- One USB receiver at the bottom of mouse, Just Plug and Play!. Ergonomic Design: The ergonomic upright mouse offers your hand maximum support, encourages natural “handshake” mouse holding. Best care of your wrist and palm, Stop hurting your hand. Dimension: 4.1*2.7*2.3 inches.