Say goodbye to indoor pests with this ultrasonic pest repeller. It uses upgraded ultrasonic and electromagnetic waves to emit different - frequency ultrasonic waves, effectively repelling rodents, spiders, and insects. Each unit covers up to 1600 sq. ft., making it suitable for various indoor spaces like homes, warehouses, and offices. Using it is a breeze - just plug it into an electrical outlet. When the blue night light comes on, it starts working, and most users notice a difference within 2 - 3 weeks. It's safe for humans and pets as the ultrasonic sound is inaudible to them. Whether it's your bedroom, kitchen, or living room, this repeller provides all - round protection, bringing you a pest - free living environment.