Proven Technology Prevents Pest Infestations: Electronic rodent repeller uses a combination of electromagnetic interference and ultrasonic frequency sounds to drives away common household pests like mice, rats, spiders, and roaches Electromagnetic Technology: Modulates the electromagnetic field produced by your home's power supply to create an uncomfortable environment for unwanted pests trying to nest and hide inside drawers, cupboards, and walls Ultrasonic Sound Waves: Emits high-frequency ultrasonic siren bursts that cause discomfort to rodents like rats or mice but can't be heard by humans and pets; On/off switch on the side disables the sound waves as needed Sweep Sound Technology: Innovative twin speaker rat repeller fluctuates between different ultrasonic frequencies to confuse and disorient rodents and insects while preventing them from becoming acclimated to the noise 2500 sq ft Coverage: Convenient plug-in device covers up to 2500 sq ft (230 sq m) making it ideal for preventing infestations in homes, offices, warehouses, barns, and restaurants without messy sprays or lethal traps