... rats, cockroaches, fleas,crickets, ants and most of the other common pests. Laboratory research has shown ultrasonic sound waves attack ... , fire or smoke detectors, pacemakers, hearing aids or other electronic equipment. ATTACK WAVE PEST REPELLER will not harm plants, either ... PEST REPELLER on carpeted surface, behind furniture, draperies or other soft objects which likely to absorb the sound waves. ...