Live in a place where mosquitoes harass you know end? maybe you want to take a break from the chemical repellents! Try driving away mosquitoes with ultrasonic waves. I had seen them on mobile phones but came across one which works on Windows 7 too.
Tolak Nyamuk (!) is an electronic insect repellent. It is specifically a computer application to drive away mosquitoes.
This application works by generating a high frequency ultrasonic waves, the frequencies that are not easily heard by human ears, but sensitive to certain animals, such as mosquitoes that often interfere in front of your computer.
This application is capable of producing high frequencies with a range between 20KHz to 32KHz. In order for the wave frequency can be produced, your computer should have speakers installed.
When you run the application, you will hear a low tak-tak sound.
There are many sound and tone generator programs available on the internet for Windows PC. Download and use one of them. If you need to set up the frequency manually set it around 50 Hz as that is said to be good for repelling mosquitoes.
Let me know if its working for you!