HAVIT Ergonomic Wireless Mouse 2.4GHz Optical Vertical Mouse with 3 Adjustable DPI 800/1200/ 1600, 6 Buttons (Black) [*Warm Tips:The USB receiver is inserted at the bottom of the mouse.]Scientific ergonomic design: Contoured shape seamlessly fits with your palm, allowing smoother movement and preventing wrist strain. Reliable connection: Adopted advanced 2.4GHz wireless technology, can be operated at a working distance up to 10m in 360 degree with no interference. Plug and play: Just plug the included USB Nano receiver into your computer's USB port, with no extra driver required, and soon ready to enjoy the convenience. 3 Adjustable DPI levels & 6 buttons: Easy to switch among 800/ 1200/ 1600dpi; Easy to control the mouse while using with 6 buttons (Forward button, Back button, Left button, Right button, Scroll Wheel, DPI button). System requirement: Windows: 2000/ 2003/ ME/ XP/ Vista/ Win 7/ 8/ 10/ MAC OS/ Linux