I don't know about car noise but other sharp noises such as human coughing close to the device will trigger it.
answered 6 months ago
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Before you buy multiple units, why not try one. This has not worked at all for us, but since we had to tear the box to get it out, we don't think we can return it. I think whether or not it's effective at all for many breeds is very much in question.
answered 3 years, 1 month ago
1out of 1found this answer helpful.
Car noise can certainly set it off. Us talking set it off!
answered 3 years, 6 months ago
0out of 3found this answer helpful.