Ultrasonic TechnologyThe Ultrasonic Pest Repellent uses dual ultrasonic and electromagnetic chips technology simultaneously to disorientate the hearing and nervous system of pests to quickly and powerfully drive them away. It can drive away most types of flying and crawling pests such as mosquitoes, spiders, bed bugs, cockroaches, mice, fleas, ants, fruit flies, etc. Wide Coverage AreaUltrasonic insect repellent is suitable for an area of 80 ~ 120 square meters. It's widely used in homes, warehouses, offices, gardens, hotels, etc. Since ultrasound cannot penetrate walls and solid objects, it is recommended to put one in one room. For areas where severe pests are severe, we suggest install 2 or more devices. Easy To Use, Just Plug & PlayJust plug the Pest Control r-epellent into the socket. Please make sure to install it vertically 30 cm in away from the floor. And make sure there are no barriers like curtains or cabinets covering in front of the repellent. Most customers can see the results within 2-3 weeks Safe & Environmentally FriendlyNo poison, traps and killing necessary as the insect repellent is 100% safe and harmless to humans, children and pets. Drive pests away in a non-toxic, eco - friendly way. Variety of usesThis product is portable and easy to install, just plug and play. Widely used in home, warehouse, office, garden, hotel, etc. Energy saving, keeps you safe from pest intrusion all day long without worrying about your bill.