How does the Xiaomi Smart Water Dispenser (Hot and Cold) cool the water?

The Xiaomi Smart Hot Water Dispenser (Hot and Cold) comes with an electronic cooling liner with a capacity of 0.5L. Cooling water only takes 30 minutes, with the temperature range from 7℃ to 15℃. The cooling liner adopts mature semiconductor electronic refrigeration technology. The semiconductor cold end absorbs heat to cool the water, and the hot end has a heat sink and a cooling fan to dissipate the heat into the ambient air.
Note:
When cooling the water, the cooling fan needs to dissipate the heat into the environment, and there will be the sound of the fan working. After the cooling is completed, the fan will stop working and the dispenser will be silent.