A4Tech Bloody Q8181S X’GLIDE Gaming Mouse & Mouse Pad comes with an adjustable resolution 500/1000/1200/1600/2000/3200 CPI. The 4th and 5th thumb side buttons are preset as backward and forward functions. In game-play, it will be the functions of the game settings. One-click to switch between 3 kinds of lighting effects ( Neon/ Breathing/ Solid ) for personal preference. Extreme quality offer over 10 Million clicks guaranteed. Sensitive and tangle-free cable provides durability. Durable, sensitive, frictionless. Glides 20% faster. Sustain lens working distance. Quality remains after 300Km of abrasion test.