For laptop use, it’s time to get rid of that old-fashioned “miniature mouse� and upgrade to the comfort of the Whirl Mini Notebook Mouse with ErgoMotion -- the world’s first truly ergonomic compact mouse. No other portable mouse provides the fluid, air-like comfort of the unique ErgoMotion pivot system. You can finally say goodbye to aches and pains while using a computer mouse. The perfectly portable Whirl Mini Notebook Mouse with ErgoMotion combines the remarkably natural comfort of the ErgoMotion pivot system with the three most sought-after computer mouse features: Up to 800-dpi hi-def laser sensitivity, 2.4 GHz wireless connectivity and extra long battery life. The ErgoMotion pivot system reduces your risk of Repetitive Stress Injury (RSI) by adding motion! The magic of the function is how it naturally adapts to your hand motion rather than the other way around! While all other computer mice require your hand and wrist to remain in a fixed position, the Whirl Mini pivots naturally as you move, au Hand Orientation: Both Hands Maximum dpi: 800 dpi Parts: 1 year limited Labor: 1 year limited