SADES LETTON K1 Backlit Wired Gaming Keyboard and Mouse Combo (Black) LED Backlit can switch among medium light,high light,breath mode and turn off by pressing Fn and Esc simultaneously Simultaneous operation of up to 19 keys without conflict, 12 multimedia keys, interchangeable "WASD" keys and WIN keys can be disabled for gaming 4 colors breathing light of mouseRed, Blue, Purple, Pink; Light-off mode: forward/back button+DPI Resolution up to 2400DPI, 800/1200/1600/2400DPI adjustable Compatible with Windows 2000 / 2003 / XP / Vista / Win7 / Win8 /Win10/Mac OS