a4tech v8ma bloody ultra gaming gear wired 8-button gaming mouse mice a4tech bloody basic parameters: multi-core system button no.: 7 keys + wheel direction of wheel: one way direction tracking: holeless hd engine type: wired mouse connection: usb (2.0/3.0) hardware system requirements: windows /mac os/android/linux software system requirements: windows xp / vista / windows 7 mouse size: 123 x 82 x 42 (mm) cable length: 1.8 m mouse weight: 155 g technical parameters: resolution: 100 dpi to 3,200dpi (5 ranges adjustable) image processing: 368 mega pixels / sec acceleration: 30g tracking speed: 75 inches / sec report rate : 1,000 hz(4 ranges adjustable) key response time: 1ms 160k onboard memory