The changing of the color is a feature called “breathing light”, and unfortunately it cannot be configured or paused. However, you can turn it off by pressing Forward / Back Button + DPI button. (Only works for products sold after August 2017).
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HAVIT KB487L TKL Mechanical Keyboard with 89 Keys PBT Keycaps
HAVIT KB487L TKL Mechanical Keyboard with 89 Keys PBT Keycaps
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Sale price$59.99 Regular price$73.99