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Several electronic mosquito killer systems include a separate device designed to reduce human attractiveness to questing female mosquitoes. Thus, the attractants in the capturing devices placed elsewhere become more effective.
These masking devices usually consist of a plastic casing enclosing a fan powered by 2 AA batteries. The fan helps distribute a plume of a proprietary substance that ostensibly masks human odors to mosquitoes. Thus, female mosquitoes do not recognize humans within the area as food sources.