توضیحات:

The fact is that at birth, the range of audible sounds is greater than ever. The older we get, the less sounds we hear. Don't you believe it? Check it out!
The button with the image of an adult person plays a sound that everyone can hear.
The button with the image of a teenager, reproduces this, only young people under about 15 years old can hear it. If you are reading this, I think you will find a use for this application. Have a good time!
On some devices, the app may not work properly due to the narrow speaker range!
Also, while using the app, an ad is launched once, which you can skip after a few seconds, I hope it will not interfere with you.