The ultrasonic radiator is of good quality and has a protecting casing. The mode of operation of PEST VENATOR repeller is about a high-frequency impact on the pest nerve system. Mice, rats and, by the way, all kind of hamsters will not be able to withstand such a pressure. This is the emission of sonic waves. In principle, they do not differ from those emitted when listening music on a mobile phone, watching TV, hearing voices. But there is a detail - ultrasonic frequency is above 20 kHz, in this particular case, it ranges about 50 kHz. Whereas the range of human hearing is at most up to 20 kHz, on average it does not exceed 18 kHz. In other words, the frequency is 2-3 times higher than that a human can hear. That is the tricky part. Specifications Effective distance: 860-1600 Sq.ft Frequency Range: 20-65 kHz Power Source: AC 90V-250V, 50-60Hz Power: 3W Plug type: US Plug Instructions -The ultrasonic pest repeller should be mounted vertically 25inch - 60inch above the ground. -Avoid mounting device near materials such as curtains or carpeting, as they will weaken the ultrasonic sound waves and then reducing the device's effectiveness. -It DOESN'T apply to the places which use poison bait and pesticide, such as flour processing factory, food processing factory, rice factory, pharmaceutical factory, animal feed factory, granary, etc
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