When the battery level of the Xiaomi Night Light 3 drops below 20%, it will emit a breathing light pattern three times to remind you to charge it promptly. To charge the night light, insert the USB cable into the USB charging port. During the charging process, the indicator will turn red, signaling that it is charging. Once the battery is fully charged, the indicator will turn white. The entire charging process takes approximately 2.2 hours. It is important to charge the night light when prompted to avoid any interruption in its use due to a low battery. Ensuring timely charging helps maintain the functionality and reliability of the night light, providing consistent illumination as needed.