Ultrasonic Pest Repellent Indoor Pest Control Electronic Insect Repellent For Home[2021 Upgraded Ultrasonic Insect Repellent] Our ultrasonic insect repellent uses sound waves combined with electromagnetic and negative ions. Using the latest ultrasonic chip technology in 2021, the insect repellent stimulates the sensory system and nervous system of mosquitoes through special elements in the air, so this insect repellent can repel mice, fleas, ants, mosquitoes, flies, spiders, cockroaches, bed bugs, Rodents and insects. It can then effectively repel mice and keep pests away from you.[360 full coverage] This ultrasonic insect repellent is suitable for indoor areas up to 1600 square meters, suitable for homes, warehouses, offices, hotels, supermarkets, hospitals, restaurants, garages, etc. It is recommended to use insect repellent in Room 1. Because ultrasound cannot penetrate walls and solid objects. For larger storage space, we recommend installing 2 or more insect repellents. If you install cockroach repellents in one room, they will not work in other rooms.[100% safe for people and pets] The electronic insect repellent is safe for people and pets. Ultrasound is inaudible to people and pets. It can replace dangerous poisons and chemicals. This ultrasonic insect repellent uses a specific ultrasonic frequency, only insects, bugs and pests can identify and let them scramble to find a way out. Non-toxic, non-chemical, non-toxic, non-radiation, no need to clean up dead insects, no batteries, and low power consumption.