Advanced Ultrasonic TechnologyUltrasonic insect repellent is equipped with latest ultrasonic physical technology and heat dissipation system, that emits an ultrasonic frequency to disrupt pests' Central nervous system, insect repellent can effectively repelling pests like mice. Safe and eco-friendlyThis ultrasonic rat repellent is safe for humans and pets. The insect repellent is no chemicals, no poisons, odorless, noiseless, and no radiation. The mouse repellent uses sound waves to drive pests away, the results may take 3-4 weeks, depending on the severity of the pest infestation. Quiet And EffectiveUltrasonic repellent working with low-frequency ultrasound waves, which means that it is gave you extremely silent pest control and can't disturb you and your pets. Simple in useThis mice repellent is able to be started by easy step. You just have to plug it into the outlet and then it will operate automatically. As the ultrasonic waves can't penetrale through walls, please install an ultrasonic pest repeller in each room to get the best results. Wide Coverage AreaUltrasonic insect repellent equipped dual microchip system and is suitable for the area of 800-1,200 sq ft. Ultrasonic Pest Repeller can be used in various places, such as Bedrooms, Bathrooms, Garages, Kitchens, Offices, Warehouses.