Warning to all!!! Ultrasonic pest repellers do not work!!!!

This app is a rip-off!!!

Ultrasonic devices work, according to one advertisement, by "mimicking the sound of the bat--the mosquitos greatest enemy." (They emit sound in the 20-50 kiloHertz range, higher than humans can detect.) While its true that bats eat mosquitoes and that bats make ultrasonic sounds (they navigate through a sort of natural radar), the humble mosquito apparently cant make the connection. The U.S. Environmental Protection Agency conducted two years of tests in the mosquito-ridden area around Chesapeake Bay, trying virtually every type of electronic repeller they could lay their hands on. Not a one had any noticeable effect on mosquitoes, or, if its any comfort, on humans (although some say the latter question hasnt been studied in sufficient depth). Subsequent research at various universities has pretty much borne out the EPAs findings. Both the EPA and the U.S. Postal Service have gone after ultrasonic repeller makers for making unsupported claims for their products.

Szamboti about Anti Mosquito 3.1