Bored annually by a rodent that ballad, scrapes and squeaks in the walls and ceilings I'd already borrowed devices of the same style to several people but without success. A week that I have this one and I touch wood but it seems very effective. The rodent me two lightning visits because overcome by ultrasound and for more than rodent. Ultrasounds do not agree but the machine is still a very slight tic tic audible when there 'is no noise in the room. Amazon thank you for the impeccable service as usual.
