Ant Esports KM540 Keyboard Rainbow Backlit Wired Gaming Keyboard Mouse Combo Keyboard. Supported operating systems range from Windows 2000 / 2003 / XP / Vista / Win7 / Win8 /Win10/Mac OS. Microswitches provide crisp, firm clicks. Plug-and-play, no additional software of firmware is required. 7 Circular and Colourful Breathing Effect Red, Green, Blue, Yellow, Purple, Cyan, Pink (Warm tips: cannot set in one specific color). Light-off mode: forward/back button +DPI.