The ultrasound or sonic sound and light repellents are said to drive away the rodents by frightening them. However, even if such device may seem as if they are working at the beginning, their effectiveness over a long period had not been proven yet. These might work sometimes and some people have reported it to work, any of these don't provide lasting solution for rodents in home, because they simply don't care for it enough. They have much more important worries on their mind.
The best thing is that there are now the methods that have been proven to work and they can keep the rodents away for long.
From the descriptions of the manufacturer, the sound repellent device do emit high frequency sounds waves which may repel or frighten the rodents like gophers, squirrels, moles, rats and mice. They say that the high frequency noise which is most of the time higher than that of the human will frighten or will annoy the rodents so that they can choose to go away. These repellents may be plugged within the outlet in the wall or they may use battery while most of them also have the red indicator light.
Even if the rodents such are rats can be frightened by the unfamiliar or strange noise at first, they are able to adjust to such repeated sounds. This is why frightening noise with lights will not do anything when it comes to chasing away the rodents in your garden or home. Raccoons and squirrels will also be accustomed to the repeated sounds and they may be only little attention to them in few days. There is no evidence that such sound may be able to chase away the gophers and the moles.
The right way to repel the rodents away from your property like garden or house is to ensure that the place is not that appealing to these rodents. You should remove the den sites through cutting the back overgrown vegetation near the home and by staking the firewood in a neat way. You can eliminate the food sources when you pick the fallen fruits regularly and make sure that there are not plant debris around. Make sure that your garbage cans have tight fitting lids. Do not put the pets’ foods outside and close the gaps, decks and cover chimneys with a wire mesh.
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