Use APKPure App
Get Stop Annoying Mosquito - ultrasonic repellent old version APK for Android
Repel hungry mosquitoes away. Anti Mosquito ultrasonic sound simulator.
The app does not guarantee 100% protection as there are more than 3500 known mosquito species in the world, and they all react differently to the repellent, also it depends on smartphone speakers quality.
Use the slider to find the optimal repelling frequency for the mosquitoes in your region.