TeckNet Gaming Keyboard and Mouse Gryphon Pro LED Backlit Illuminated Programmable Mecha-Membrane Wired Gaming Mouse and Keyboard Set, Spill-Resistant Design, US Layout 3 Adjustable LED Backlighting - Backlighting offers adjustable brightness, looks great with other gaming gear and makes it easy to find the exactly keys you're looking-even in dimly lit rooms 10 Programmable keys at your command: Record single keypresses, complex macros on the fly without leaving the game. Complete complex actions simpler and faster. Please note that the keyboard is not compatible with PS4. Anti-ghosting, 19 keys are calibrated to prevent anti-ghosting. Press and hold multiple keys simultaneously without fear of missing or unexpected key presses. 12 Dedicated multimedia controls - Play, stop, pause, skip tracks and adjust volume directly from the keyboard. Game/Desktop mode switch disables the Windows and Context Menu keys, so your game won't be interrupted if you accidentally press the wrong keys. US keyboard Layout Mouse: 2000 DPI, 4000 FPS, 15G ACC, Super fast game engine, 6 function buttons, built-in weights, 3 speed switch 1000/1600/2000, 2 side buttons If you ask why some keys don&#039;t work? I will suggest you to check the computer system to see if they are compatible or test on other computer to see if the problem remains.