Ergonomic Vertical Design - The vertical design provides better support for your forearm minimizing wrist pain that can come from twisting 50 Degree Vertical Angle - The “hand-shake” grip helps reducing muscle stress and risk of Carpal Tunnel Syndrome Durable Micro-switch - Up to 10 million times lifecycle Adjustable DPI Switch - Adjustable cursor moving speed from 800 1200 to 1600 DPI High-precision Optical Sensor - Tracks accurately and precisely on different surfaces like marble wood and leather surfaces