Instruct: Classify the given Amazon review as either positive or negative.
Query: Very effective, but we need more than one...

I ordered this "Scat Mat" to try to convince my cats NOT to get up on the counters or on the table top. It gives out a small shock, sort of like the static shock you can get from dragging your feet across a carpet. It has 3 "levels", Low, Med, and Hi, but we haven't had to turn it on higher than "low". It is VERY effective, and I don't think any of my cats have been "stung" more than once each. (My children, on the other hand, enjoy getting a little shock, and will play with the mat.) I know it is not hurting the cats in any way, but it sure does surprise them! The only problem I have is that it is pretty expensive and to really train them out of their naughty behavior, we need more than one mat. The cats have gotten very good at determining where I have placed the mat, so they just avoid that area and get up onto a "mat-free" area. Maybe if the price comes down I can afford to order another one.