Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simply doesn't work

Two cats peeing by the front door, so I set one up. It never, ever worked. It only makes the noise when I'm turning it on or off, and it's on off for good.The product insert says to elevate it a few inches. Man, you could give this thing a hot air balloon tour and it still wouldn't matter. I am EXTREMELY disappointed and feel very jipped. The seller should DEFINITELY allow an exchange, even if just the motion sensor and sound part (I don't use the spray). I really wanted this to work, but it doesn't.