about this project Unique Technology: Ultrasonic Pest Repeller adopts intelligent three-layer bionic waves, it works by sending out confusing pulses, directly affects the nerve hearing and immunity of each pest, keeps pests away from your home or office, suitable for home, warehouse, office ,hotel. Safe to use: The ultrasonic insect repellent is friendly to both humans and pets, and can repel all kinds of small enemies, such as rats, rats, mosquitoes, flies, beetles, cockroaches, moths, ants, bedbugs and more. Wide Coverage: The insect repellent covers up to 115 square meters. You should use one unit per room for best results, as ultrasound cannot pass through walls or solid objects. Indoor spaces suitable for this ultrasonic repellent add-on are houses, garages, offices, companies, restaurants, warehouses, etc. EASY TO USE: This indoor rodent repellent can be started with simple steps. You simply plug the spider repellent into an outlet and it works automatically. Rodent repellants must take several days to be effective.