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 pleasantsensation 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. 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: 1.5V/ 20mA Power supply: 2 * AAA battery (Not included) 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 Item weight: 88g/ 3.1oz Package size: 12* 8.5 * 8.2cm/ 4.72* 3.35* 3.23in Package weight: 119g/ 4.2oz Packing list: 1 * Wireless Vertical Mouse 1 * USB receiver