Optical Mouse Vertical Model Ergonomic Design - Prevention of Mouse Syndrome/Tennis Syndrome Wireless Mouse, 5 ButtonsCSL - Wireless Right Hand Mouse | USB Optical Mouse (Wireless) | Vertical Model | Particularly Restful for the ArmUSB 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 Surface5 Buttons and Vertical Scroll Wheel| Left and Right Mouse Buttons| The Next and Previous Button Provides Remarkable Optimal Comfort When Surfing the Internet | Easy-to-use Buttons and Vertical Scroll WheelTake Precautions to Avoid Possible Mouse Syndrome, or More Specifically, Tennis Syndrome (RSI Syndrome) | The ideal choice for Internet users and for people who work on their computer for a long time every dayImproved handling compared to classic mice Color: black