Go away! The High Power 'Frequency Shifting' Ultrasonic Pest Repeller uses frequency shifting techniques which may prevent pests from developing an immunity. The device has an output of 140dB that can protect up to 280 square metres. The repeller may be effective against mice, rats, roaches, fleas, flies, crickets, silverfish, waterbugs, moths, ants, spiders and most other common pests. The ultrasonic frequencies used are out of the hearing range of humans and most household pets such as cats, dogs, fish and birds etc. A test feature down shifts the frequency output to an audible range. High Power 'Frequency Shifting' Ultrasonic Pest Repeller Specifications: Frequency shifting technique which may prevent pests from developing an immunity 140dB output that can protect up to 280 square metres Effective against mice, rats, roaches, fleas, flies, crickets, silverfish, waterbugs, moths, ants, spiders and most other common pests Out of the hearing range of humans and most household pets such as cats, dogs, fish and birds etc Supplied with mains plug pack and installation guide 120mm dia x 75mm high Note: Not designed for outdoor use.