Ultrasound Barrier

Do you want away the enemy?
This app protects you with ultrasound.

Protect them from the next foreign enemy.
+ Fly
+ Mosquitoe
+ Dog
+ Cat
+ Rat
+ Youngster

[How to use]
1.Tap the icon of interest.
2.Ultrasound is generated from the speaker.
3.Stop when you again tap the icon.