Hearing Test
You are an easily repelled teenager
The mosquito device was made for the likes of you. You are probably begging to make the noise stop!
The highest pitched ultrasonic mosquito ringtone that I can hear is 18.8kHzTest your own hearing at Ultrasonic ringtones
This was done at work where I have kinda crappy speakers, so I may be able to hear better than this.
Interestingly enough, I'm getting to that dottering old age where I'm repelled by teenagers. :)