Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Does the job

The Kill-a-Watt did exactly what I hoped it would --- tell me how I was running up a $450+ electric bill every month. Among other things, I discovered that the 5 PCs we have running continuously in the house consume almost 1000 watts. (And this only drops to about 650 watts in standby mode.)Very simple and straightforward to use.