Optical Mouse Vertical Model Ergonomic Design - Prevention of Mouse Syndrome/Tennis Elbow Wireless Mouse, 5 Buttons CSL - Wireless Right Hand Mouse | USB Optical Mouse (Wireless) | Vertical Model | Particularly Restful for the Arm USB 2.0 | Optical Sensor | High Sensitivity Compared to Other Conventional Optical Mice / Scanning Frequency of 1,000 - 1,600 DPI (with DPI Selector Allowing You to Choose Freely) / Precise Manipulation on Almost Any Surface 5 Buttons and Vertical Scroll Wheel | Left and Right Mouse Buttons | Next and Previous Buttons Provide Optimal Comfort When Surfing the Internet | Easy-to-use Buttons and Vertical Scroll Wheel Helps Reduce Risk of Repetitive Strain Injury (RSI) | Ideal Choice for Internet Users and for People Who Work on Their Computer for Long Periods Improved Handling Compared to Classic Mice Color: Black