in the house of nikolai lukinsky , four powerful and tested repellers were installed at once the expertch other without gaps and were not blocked by furniture. yes, here we observe the same signal of the order of 86-90 db , that is, uh, here is a mouse, the sky is running, measurements show that the signal is not weakening anywhere. the same values \u200b\u200bof 88-89 db well, how will this affect the health of the honored artist of russia, because according to sanpin in living quarters, noise with a volume of up to 75 db, that is , scarers, is allowed, then the bar is exceeded and it is recommended to turn them on only when there is no one at home, however, the manufacturer is explained , that the sanitary code says the noise that a person is able to hear, and although ultrasound is very loud, the human ear cannot catch it for a person with an absolutely harmless hearing aid. physiologically , they are arranged in such a way that there is a hammer bone, and not too heavy to oscillate from ultrasound. so yes, such devices work and can help, though even there may be bad reviews about