Hz King - Sound wave maker tha

This is a simple but not simple sound wave generator
Freely adjust the small sound wave in major, one key to control the volume, control the frequency
We can use these things to train pets, repel mosquitoes, flies, etc.
According to scientific research, some frequencies of noise can repel or attract mosquitoes
Dog whistle, cat whistle, and all animals that can be trained can be controlled by this App, as long as you operate properly
Our App is completely free and will not charge any fees!