# motion sensor with high pitch noise?

Don't know exactly where I should post this but I'm pretty sure it would be fine here . I was walking home right now late a t night and I walked by this persons house and out of no where I heard a click and a really high pitched sound that made my ears ring suddenly came on then I kept walking and what I assume was the end of his house another time that high pitched sound came on . Is this a motion sensor of sorts or am I going nuts? I didn't walk back to see or try it again cuz it creeped me out I was wondering if there was motion sensors like this or is it something else. Thanks for reading.

• am I going nuts? ... we are not qualified to answer that – jsotola May 27 '18 at 1:36
• I heard a click and a really high pitched sound .... if it was a motion sensor than it would be on constantly ......... it is probably an animal deterrent, and i see that it works on humans also – jsotola May 27 '18 at 1:38
• Just looked up animal detternet and it sounded exactly like it with a click and everything xD – John doe May 27 '18 at 1:47