Those mosquito things are awful, I'm in my early 30s so I can't really hear 17.4 Khz tones anymore, but my neighbors have this awful animal repellent device in their garden that goes off during the night, it's about 12-15 Khz and is infuriating.

That's a great way to make sure to have zero bird population around your place very soon. Which will come with a new peak of insect population.