WE, I think some us just have more sensitive ears. I can hear bats clicking, but no one else in my family can. I also hear the 'sonic' devices outside shops to deter rats and teenagers from loistering on the highstreet.. and the hum of high voltage power lines.
I an hear bats too. I think the device will be fine. I heard it when I was putting it together inside, but outside it drown out by planes, motorbikes, yelling neighbours. Yeay! Lol.
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