Your iPhone / iPod can also prevent the mosquitoes bites ! By emitting a high frequency sound inaudible to humans, mosquitoes will stay away. High frequency sound is the weak point the best known in mosquitoes and scientific studies consistently showed it. This sound is inaudible to the human ears but unbearable to mosquitoes.
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)!