It can be detected with the function of smart phone, which is simple and convenient. The specific detection methods are as follows:

1. Click the application option of mobile phone system;

2. Then find the toolbox option;

3. Select OK in the pop-up prompt window;

4. Find the decibel meter tool;

5. At this time, the decibel level of your room can be detected, and the noise level is the level of the decibel meter.