FightEver 2.4Ghz Wireless Optical Vertical Mouse,Rechargeable Ergonomic High Precision Optical Mice with USB Wireless Receiver Super Comfortable 1.Scientific ergonomic design encourages healthy neutral wrist and arm positions for smoother movement and less overall strain. 2.Ergonomic 2.4GHz Wired Mouse is as good as it gets when it comes to comfortable mice 3.High-resolution optical sensor with adjustable sensitivity for accuracy and responsiveness 4.800 / 1200 / 1600 DPI: Featuring optical tracking smooth movement and adjustable DPI settings, 5.Integrated 2.4GHz RF Wired Technology allows this mouse to work seamlessly for computer laptop iPad or any tablet.