-Six Gear DPI, the highest resolution up to 4000DPI, and different scroll whell LED indicate each 500DPI(red), 1000(Green), 1500(Blue), 2000(purple), 3000(pink), 4000(Cyan).
-High End Optical engine, precise positioning.
-OMRON button life time up to 10 million times.
-Ergonomic design, comfortable hand feel without fatigue
-HP standard one-year limited warranty from date purchase