An app to repel mosquitoes?

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(WTVR) Just in time for summer and all that standing water comes a smart phone app that repels mosquitoes.

It's been downloaded by millions.

The app claims to produce an ultrasonic high pitched sound -- undetectable to the human ear, but that scares mosquitoes.

Reviews of the app and others like it are mixed. There are several free versions, just search in the Apple store.

Tell us in the comments which do or don’t work for you.