this is a high-end brand mechanical macro definition gaming mouse for game lovers. ergonomic design, very comfortable for you to use for a long time. with features like 7 programmable buttons, cool led variable light effect and 8 levels of adjustable dpi, this mouse will bring the most comfortable gaming experience that you never have before. this mouse looks cool and full of personality. it is a perfect comrade in game. features: ergonomic design: this mouse fits for you comfortably under your palm and you will not feel tired during long time using. 7 buttons for more convenient game operations and you can set buttons function through the driver software freely. 8 levels of adjustable dpi provides precise positioning and helps you win the game. cool led lighting effect, which will decorate the gaming combat atmosphere and bring you a vivid gaming experience. built-in counterweight modules built-in removable 4pcs counterweight modules, and you can adjust the weight freely. system requirement: for win xp/win7/win8/win10/vista, or for ios or latest. tail adjustment design, more free adjustment to adjust the length of the mouse tail as desired the mouse tail can adjust the mouse size and hand distance, adapt to most gamers' hand types, and different game operation requirements.