In order to take into account the time and accuracy of heat preservation, Mi Smart Kettle Pro adopts two-stage heat preservation. Take the normal temperature of 20°C and the heat preservation block of 70°C as an example: the first stage: 20~65°C, using full power Heating, the temperature rises rapidly to 65°C; due to high-power heating, a loud sound can be heard. The second paragraph: 65-70°C, using low-power heating, gradually climbed from 65°C to 70°C, and then maintained At this temperature; due to switching to low-power heating, the temperature climb slows down and the sound is almost inaudible.