【Ultrasonic Technology】The ultrasonic rodent repellent physically repels mosquitoes through a continuous alternating frequency of ultrasonic and electromagnetic waves, you no longer need to deal with pesticides or toxic chemicals. 【Harmless to Children and Pets】Our ultrasonic rodent repellent is safe for people, cats and dogs. Depending on the severity of the pest infestation, results are usually visible within 3 to 4 weeks. It is radiation-free. Safer Indoor Mosquito Repellent Ultrasonic for Home. 【Easy to Use 4 Pack】This ultrasonic mosquito repellent pest control can be used in any home where it can be powered, such as kitchens, bedrooms, basements, garages, warehouses, etc. Simply hold the ultrasonic rodent insect repellent on the ground, plug it into an outlet and it will work automatically. 【Large Coverage Area】The ultrasonic rodent insect repellent is suitable for an area of 80-120m². We recommend installing one device for each room. Which effectively disrupts the hearing and