The pitch of the sound is so high that most humans will not hear anything. Only female mosquitoes bite humans and animals. They are attracted by light, body odor, lactic acid, carbon dioxide and heat. Turn on the application and keep it close to you it will produce high frequency sound and mosquitos will avert you. It is not 100% guaranteed but will repel most of mosquitos biting you. Its not foolproof because there are about 3500 admitted mosquito species in the world and they all react marginally different to the repeller. The app does not guarantee a 100% protection as there are over 3500 known mosquito species in the world and they all react slightly different to the repellent. Use the pitch selector to find optimal repelling frequency for the mosquitoes in your region. You can change the frequency of the ultrasound to make sure you find the ideal frequency (the higher the frequency is, more efficient it is)!
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