Why there's noise while using the Xiaomi Microwave Oven?

Microwaves make all kinds of sounds while running. Most of these are normal and you can use it with confidence.
The explanation of sounds that often occur is as follows:
1. A sizzling sound when turning on the microwave: The normal sound of starting the magnetron;
2. A popping sound when starting the microwave: The startup sound when the transformer works at high voltage and high frequency;
3. Popping noises when heating meat: A popping sound is normal for foods with high fat as heating begins at the internal of the meat and the vaporized water and oil burst inside;
4. A banging sound during operation: This is because the adjustment of the microwave oven's power is realized based on the intermittent power supply to the high-voltage area (transformer and subsequent components). When the transformer is powered, it will make a bang sound;
5. A whirring sound during operation: The resonant frequency of the magnetron is much higher than the frequency that the human ear can hear. The whirring sound that comes from the cooling fan of the magnetron, is a normal phenomenon;
6. Buzzing during operation: This sound comes from transformers, diodes and capacitors, which vibrate and hum as the voltage gradually increases, which is normal.
Note:
The noise of the Xiaomi Microwave Oven is within 65dB(A). It is the normal working sound, please feel free to use it.