Close friend of mine showed me this application. a very interesting application 
I hope that you will love
https://itunes.apple.com/us/app/easy-anti-mosquito/id665875271?mt=8
or
ma.petek.me/antimosquito
EASY ANTİ MOSQUİTO
Description
This app generates sounds between frequencies 8 - 22 Khz that annoys and keeps mosquitos away.
Features:
- Easy to use, simple user interface.
- You can switch between frequencies or use automatic mode.
- You can set timer up to 1 hour for auto power off.
Notes:
- Do not listen music while using this app.
- Be sure that your phone's volume is on, otherwise app may not work.
I hope that you will love
https://itunes.apple.com/us/app/easy-anti-mosquito/id665875271?mt=8
or
ma.petek.me/antimosquito
EASY ANTİ MOSQUİTO
Description
This app generates sounds between frequencies 8 - 22 Khz that annoys and keeps mosquitos away.
Features:
- Easy to use, simple user interface.
- You can switch between frequencies or use automatic mode.
- You can set timer up to 1 hour for auto power off.
Notes:
- Do not listen music while using this app.
- Be sure that your phone's volume is on, otherwise app may not work.