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press and hold the power switch for 3 seconds to turn on the light; the default light is warm yellow 3000k color, then quickly press the power switch to change the color: white light 5500k - warm white light 4500k - turn off the light. press and hold the power button to adjust the brightness of the current brightness to 100%, then release and maintain the brightness from 100% to 15%. in the memory function of brightness, the default value is the brightness used last time.