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For Home Indoor Ultrasonic Mosquito Mouse Repeller Electronic Anti Rodent Insect Pest Control Repellent. QS + QC dual frequency modulation prevents mice and mosquitoes from developing immunity. Using microelectronic technology can produce dual frequency ultrasonic waves alternately and intermittently at the same time. To prevent mice and mosquitoes from becoming " adapted " to a fixed frequency. Dual-mode FM drives out not only mice but also mosquitoes and flies Cockroaches, etc, can be used to meet the needs of the family frequency. Ultrasonic rat repelling principle: The instrument interfered with the rats by the frequency conversion of multi-stage ultrasonic stimulation frequency, which made the rats' hearing level disordered. Mice feel panic, and then automatically migrate, to achieve the mouse effect.