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 4,000 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. PRCPSIRLH