You can know the noise level in decibels that is also represented by funny traffic lights.
It is useful for:
♥ Teach to your children pupils to keep an appropriate level of noise ♥
✍ Improve your work meetings environment ✍
♪ Or even to moderate your meetings with friends ♪
... It is free and without ads!
(although you can thank me the work buying premium features if you like the App ;)