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This repeller may be effective against mice, rats, roaches, fleas, flies, crickets, silverfish, waterbugs, moths, ants, spiders and most other common pests. It has an output of 140dB that can protect up to 220 square metres and uses frequency shifting techniques which may prevent pests from developing an immunity. The ultrasonic frequencies used are out of the hearing range of humans and most household pets such as cats, dogs, fish & birds etc. A test feature down shifts the frequency output to an audible range. We make no guarantees that this device will solve your particular problem, but there are thousands of people who swear by them.• Supplied with mains plugpack and installation guide