First I sent the first answer answered that it doesn't work. I have another who thinks the same way, but I heard a very faint high frequency tone. I hardly heard it, but it seemed like I put it on my leather sloth. My dachshund jumped up and jumped right back down. Now he no longer sits on a chair, although he used to sleep on it. I tried to find my one star review to update it but couldn't find it so I'm giving it another review. I will order another one for my sofa. He pees and poops on him. Hope it works.
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