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Beware of marketing scams. Most people have seen advertisements for fancy ultrasonic mosquito repelling devices intended to drive off mosquitoes by subjecting them to repelling ultrasonic vibrations. These gadgets sound great, except for one thing--they don't work. Both scientific and anecdotal evidence indicates that as mosquito repellents, ultrasonic really don't seem to have any effect.
*Don't be fooled by expensive, high-tech gadgets!