Upgraded ultrasonic technology:] With the advanced principle of microcomputer control, it can release 18 sound waves with different frequency pulses. The ultrasonic wave changes continuously in the range of 22KHz to 65KHz, which disturbs mice, spiders, flies, fleas, ants and other kinds of insect nervous systems, make them feel uncomfortable and escape our house. [Innovative Frequency Conversion Function: ] Electronic Pest Repeller has 5 frequency conversion modes(The frequency will change automatically according to the different modes of operation). and adds the optical drive function. Flashing optical drives and high frequency conversion sound waves can avoid mouse adaptability. Improve rodent repellent efficiency. [Easy operation and operation: ] The ultrasonic pest repeller is easy to install and operate. All you need to do is plug the pest control into the outlet 19-59 inches from the ground and press the switch. Then it can run automatically without any complicated installation process. [Safe for humans and pets:] The Ultrasonic Pest Repeller is made of flame retardant ABS material, durable and environmentally friendly, non-toxic and harmless. And repelling mice, cockroaches, mosquitoes and other pests with physical methods, the pest repeller only acts on pests, no harm to your families and pets. [Large Indoor Coverage: ] The pest repeller measures a maximum of 160m and can be used in hotels/warehouses/garages/bedrooms/offices, etc. Please use ultrasonic insect repellent continuously for about 3-4 weeks. You will find that harmful organisms are gradually reduced. In order to achieve a better repellent effect, we recommend equipping each room with ultrasonic insect repellents.