Description: Updated technology: Our ultrasonic insect repellent's ultrasonic and electromagnetic dual chips emit frequency ultrasonic waves, which interfere with the hearing and nervous systems of pests, making them feel uneasy and uncomfortable, keeping pests, mice, rodents and mosquitoes away from your home. Effective coverage: The repellent is effective in indoor areas up to 1600 square feet. It is widely used in homes, warehouses, offices, gardens, hotels, etc. We recommend that you install one for each room, as ultrasonic waves cannot penetrate walls and solid objects. But for areas with serious pest infestations, we recommend installing 2 or more devices in other rooms. If you install devices in one room, they will not work in other rooms. Easy to use: Simply plug this repellent into an outlet and perpendicular to the floor. The machine starts working when the blue light turns on. For areas with serious insect infestations, two or more types of ultrasonic need to be used additionally. Generally speaking, it takes 3-4 weeks to take effect. SAFE AND ECO-FRIENDLY: Ultrasonic pest repellers contain no chemicals, are non-toxic, consume less power, make no sound, 100% safe for humans and pets, no need to clean up dead pests, no more calling technicians for help, No batteries required, saving a lot of money. CONVENIENT AND MULTIPURPOSE: Our ultrasonic pest repeller is not only effective at getting rid of mice, but also other common pests. Specifications: Color: white. Material: ABS. Size: Approx 13*7*6.5cm/5.12*2.76*2.56inch. Size: Size: Approx 13*7*6.5cm/5.12*2.76*2.56inch. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included: 2pcs*Mosquito repellent