William Joseph's Mosquito Annoyer works on this premise: The only mosquitos that bite are the pregnant females. The little box emits the sound of the "horny male" mosquito, which the female now has great disdain for. So instead of sticking around and trying to feed on you, she goes elsewhere. Testing by WilliamJoseph has found it to be very effective. The Mosquito Annoyer does not eliminate all bites, but about 95 to 98% of them.