CHUYI Ergonomic Vertical Wired Mouse 1600 DPI 5 Buttons Optical Wired Mouse Office and Gaming Mouse with a 4.49 feet (1.37 Meter) Cord for PC Computer Laptop Notebook for Right Hand (Black) Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain 1600 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces Side of the custom button can be set up and down the page, improve operating speed, increase efficiency 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 Compatibility: This comfortable ergonomic mouse is compatible with Mac OS X, Linux and all versions of Windows