I use the device might not be exactly as it is meant for us to come in the attic from time to time Marder over and sits with me the device to a wireless socket, which I can switch on and off from the bottom. it can be heard absolutely gorgeous then whiz the marten in panic. so it is definitely better than animals with an ultrasonic emitter. namely they must be so loud that the marten permanently numb. However, the device has now after a few months already given up the ghost and works only sporadically. it is at least possible that this is the temperature in the attic - is not the same as I sit down to a point - cold, of course.
