description: How it works: The patented system sends ultrasound to confuse and disturb pests, so they cannot forage or build nests there to drive them out of their homes. Effectively repel rodents, cockroaches, spiders, mosquitoes, bed bugs, and ants. 100% safe for children and pets: humans and household pets cannot hear ultrasound; environmentally friendly alternatives to harmful and dangerous chemicals, poisons and traps, no peculiar smell. You try it risk-free: we hope you feel great when using our ultrasonic insect repellent, but if you dont like it, just return it and we will refund every penny. Easy to use: Mini size, just plug it into any socket; suitable for medium-sized rooms, kitchens, garages, lofts and basements. Note: The product picture may cause errors in the actual product due to various factors such as various lights, displays, etc. The product size is manually measured, and there are certain errors. I hope to understand, thank you.