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 2 years, 1 month ago
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Car noise can certainly set it off. Us talking set it off!
answered 2 years, 7 months ago
0out of 2found this answer helpful.