CHUYI Vertical Mouse Optical Mouse Mice Ergonomic Design for Computer Laptop Blue Color Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. 1000 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. Product Dimensions:102X85X72mm All buttons are easily operable without contorting your fingers. The button force is light for easy clicking, but still firm enough to avoid accidental actuation. Package includes: 1 Vertical Ergonomic Optical Mouse