@ flowman if hear you. Its indeed good that we share knowledge 7 xperience.
You can relax,the tone from your phone/ low power computer speakers is not harmful. The sound llevels are too low,especially from a phone.
From what found from internet,the mosquitos find the sound annoying. Though exposing the sound for a long time - conditios the mosquitos to realize that the annoyance is not harmful after all. may be what i would suggest is get the software running throught the day with the windows open - this will drive away the animals,then in the evening close the windows and doors. I think this will be somewhow effective.
I know if the software is from a phone it can kula alot of power and will need subsequent recharging. May be try downloading from here and put burn it into CD and play in your CD player or put it direct to your home theater to play thorught the day.
Please be sure to check with some teens/kids to make sure they can't here the sound. If they hear,google for a more high pitched sound - the one above is 20KHZ.
all the best. We can always compare the notes tommorrow.
i too