This Pest-Stop electronic large house pest repeller offers the domestic user a contemporary aesthetically pleasing and effective solution to pest problems in the home With a coverage of 4000 square feet this repeller can easily cover a large house As well as ultrasonic the repeller uses electromagnetic waves and is highly effective against rodents and most crawling insects It has a large speaker and an LED light which is lit when the repeller is working and differentiates between the settings Full instructions supplied