Fire Tracks Limited Ultrasonic Pest Repeller, 4 Packs, Electronic Indoor Plug in for Insects, Mice,Ant, Mosquito, Spider, Rodent, Roach, Mosquito Repellent for Children and Pets' Safe

Brand: Fire Tracks LimitedFeatures: [Driving All Kinds of Pests]: The Pest Repeller keeps all kinds of insects away from your house, which works great for Spiders, Mosquitoes, Bed bugs , Cockroaches , Mice , Fleas and some other rodent pests. [Easy Installation]: Simply plug the device in to household power socket vertically. Installing the devices 30-70 inch from the floor is recommended. The blue LED light illuminate, indicating the device is working. [Safe and Environmental Friendly]: No harmful chemicals or toxins. The ultrasonic frequency cannot be perceived by humans. Harmless to humans and pets. [Wide Effective Coverage]: This Insect & Rodent Repellent is effective in an indoor area up to 1600 sq. ft. It’s widely used in homes, warehouses, offices, gardens, hotels, etc. We recommend you to install one for each room because the ultrasound cannot penetrate walls and solid objects. But for areas with serious pests, we suggest install 2 or more devices for other room. They aren