Play It Down is a fun product that can be incorporated into your iPhone. The product is designed to test the hearing power of your ears.
The way it does this is it plays out any music that you select at any age possible. If you find that the way it should be heard is not being heard by you, that is the time you should decide to call up a doctor. Moreover, the product also tests your hearing prowess making you listen to different frequencies so that you can test it against the loudest and the slowest.
You can additionally also take comparisons of different sounds that occur around you and decide which is safe for your hearing.