How do you feel, if you're working in front of your computer and annoyed by mosquitoes. of course it is very disturbing your concentration of course so you need to require a device or software to eliminate interference caused by the mosquito, without using of liquid mosquito repellent.
so, why you don't make you PC become an anti mosquito. You need a good quality of speaker only, and i think you already have it and then install the anti mosquito for windows 7 into your PC.
After you install the software, just click on the activate button to enable the anti mosquito software and then starting to produce to mosquito repellent ultra sound.
The sound range which is this program produce beyond the hearing range of humans. That's why you can't hear it. Pests and other animals can through hear the very same frequency. This sound produces an undesirable effect on mosquitos and other pests thus restrain them from flying. This ultra sound is completely safe from damaging your hearing.