This application will generate sound at 17 KHz to 20 KHz depending on your mobile phone speaker capability.
Sound volume can be adjusted in the app itself.
Usually these sounds can not be heard by adult. But can be heard by baby or toddler or adult with a very good hearing capability. It might be annoying sound to them.
Caution that these sound can make your pets inconvenient.
These app might also repel mouse, squirrel, stray cat or dog.
Notes : ********
This app is an entertainment only purpose.
You may use it as is. No effectiveness guarantee.