This Wireless Vertical Mouse adopts 2.4G wireless technology which ensures stable connection and offers 3 DPI levels for choice. What’s more, with vertical design, it will relieve wrist fatigue to some extent. Feature: 2.4G Wireless Technology It ensures the stable connection and free you from the twisting cables. 3 Adjustable DPI Levels It offers you a pleasant sensation of higher speed, less delay and more correct location.   Ergonomic Vertical Design Compared with traditional mouse, the vertical design relieves the fatigue of your wrist, and offers you comfortable feeling for touch.  Rechargeable Design With built-in lithium battery, it ensures long time working. Besides, you can also charge it with USB cable. Free from low battery. Optical Tracking Technology It ensures more correct location. Plug and play No drivers required, just plug the USB receiver into the USB port of the device, easy to use.  Specification: Brand: YWYT Operating distance: 10m Rated voltage/ current: 3.7V/ 100mA Color: Black Button quantity: 6 DPI level: 800/ 1600/ 2400 Supported system: Windows 98 / Me / 2000 / XP / Vista / Win 7 / Win8 / 10 / Vista Mac OS or above  Keystroke life: 8 million times Material: ABS Cable length:0.7m Item weight: 97g/ 3.42oz Package size: 12* 8.5 * 8.2cm/ 4.72* 3.35* 3.23in Package weight: 142g/ 5.01oz Packing list: 1 * Wireless Vertical Mouse 1 * USB receiver 1 * USB cable