What is keep warm after boil in Mi Smart Kettle Pro? How does it work?

Keep warm after boil: After the water is heated to boiling, it will naturally cool down to the set temperature and keep warm at this temperature. Operation is as follows: 1. Open the settings in Mi Home App, open keep warm after boil. 2. After the kettle is filled with water and powered on, press the "Boil" button, the indicator light goes out after boiling, and the heat preservation indicator light stays on in red. 3. When it cools down naturally to the set block temperature, a "drip drip drip" sound is emitted and the heat preservation indicator light stays on in orange. "drip drip" sound, insulation indicator orange light, maintained at this temperature for insulation, the default insulation 12 hours, can be modified in APP (range 1-12h, increase amplitude 0.5h), insulation will enter standby after the end of the state. 4. insulation again by pressing the "insulation 4.Press the "keep warm" button again to cancel the insulation, insulation indicator light off, the kettle enters standby mode.
Note: 1. "keep warm after boil" default off, after boiling will not keep warm.2. Due to differences in altitude in different regions, the temperature displayed when boiling and the actual water temperature is slightly different.