I downloaded(out of curiosity) an Anti-Mosquito application from Windows store a couple of weeks ago for my laptop(Lenovo Y560) which emits what they call a "very unique and high frequency sound" or "Ultra Sound" to keep mosquitoes away. I used the app at a frequency between 10 kHz and 20 kHz for testing purposes.
I used the app at 10 kHz and it emitted a continuous beep noise. When I toggled it to 20 kHz it made some popping noise (like kit kit) which was not loud but clearly audible and within 5 seconds I could smell something burning from my laptop. I have hardly used the app for around 5 times or so in the past month and when I play anything on my laptop now - It plays the audio/video file but I also hear a crackling noise with it. There is also a burning smell when the speakers runs for more than 3-4 mins. My drivers are fine because the headphone is OK.
P.S. - I am only interested to know if this app emitting the high frequency noise has or may have caused an hardware issue and not suggestions on how can I use a fan to keep mosquitoes away. Thanks.