Ultrasound technology against mosquitoes. Once connected, it covers the surrounding area with sound waves. The sound bombards the nerve symbol of most species of flying and crawling insects. The Ultrasonic Pest Repeller will not pests, but will scatter them. No chemicals and ecological compound. Electronic ultrasonic pest repeller without chemicals and without noise. The sound is not on the ear and does not disturb and stimulate humans, cats and dogs. Our mouse combo is harmless and safe for families and pets. Your feeling is important to us. Wide coverage area: This double microchip system is an ultrasonic insect repellent for pigeons and is suitable for an area of 80 m. Protect your house, furniture, pets and family all year round. It is an ability to separate the wall and repel most insects. It is widely used in homes, warehouses, offices, gardens, hotels, etc.