![](https://img.alicdn.com/imgextra/i4/757293554/O1CN013whVGw1c7mAF4jhEw_!!757293554.jpg)
![](https://img.alicdn.com/imgextra/i1/757293554/O1CN01tRYk8v1c7mAG2uQl7_!!757293554.jpg)
According to ordinary people’s hearing:
0 -2 0 decibels very quiet, hardly felt
2 0 -40 decibels quiet, like a soft voice
4 0 -6 0 decibels, ordinary indoor conversation
6 0 -70 decibels Noisy and nerve-damaging.
70 -90 dB Very noisy, nerve cells are damaged.
9 0 -1 0 0 decibels Increased noise and hearing loss.
![](https://img.alicdn.com/imgextra/i2/757293554/O1CN01daOVm31c7mABrAxle_!!757293554.jpg)
![](https://img.alicdn.com/imgextra/i2/757293554/O1CN01U3oX5s1c7mABjyRvW_!!757293554.jpg)
![](https://img.alicdn.com/imgextra/i1/757293554/O1CN01nMNLTd1c7mAAc7rj2_!!757293554.jpg)