Electronic insect repellent uses bionic electromagnetic waves to disturb the hearing and nervous system of pests, which can drive mice, cockroaches, ants, spiders, vermin, mosquitoes, insects, flies, fleas and other annoying pests away from home.Wide coverage: Widely used in private homes, warehouses, offices, gardens, hotels, etc. It is recommended to install one for each room as the ultrasound cannot penetrate walls and solid objects.