Keyboards rainbow backlit with 3 grade brightness(high light,medium light and low light)"Fn +ESC" , you can change them as you like,the backlight will be closed after pressing "Fn +↓" three times. Professional Mechanical feeling backlit gaming keyboard and mouse for gaming and office. Compatible with Windows 8, Windows 7, Windows Vista, Windows XP or Mac OS. We promise our customers 1 year warranty and life time technical support. Note:If the product has any use problems, please feel free to contact us and we will serve you wholeheartedly.