We get squeezed like a bar rag every month by SDG&E; in San Diego, so I bought this going to the ends of the earth trying to bring down triple-digit electricity bills. It worked OK for a couple of months, then suddenly it wouldn't power off devices anymore no matter how I tweaked the sensitivity. After reading more recent reviews here--it looks like people having problems with this device are streaming in.I wouldn't buy this--obviously it's totally unreliable and $30+ down the drain.