Instruct: Classify the given review as either positive or negative.
Query: Waste of money

Worked in the pest control industry for 16 years, till recently. We used to find cockroaches living in such devices all the time (it's usually nice toasty warm in there). Sanitation, exclusion, and very careful application of pesticides is what you need.Rodents are often repelled for a brief time, but quickly adapt (adapting to environmental conditions is one of the things rats do best). Again, count on sanitation, exclusion, and traps; try to avoid baits because you'd rather know where the little s.o.b. died (i.e. in a trap, rather than in a wall somewhere).