SAFE FOR HUMANS AND PETS With no harmful chemical substances or toxins, the pest repeller is safe and harmless to humans, children and pets.This indoor complement emits invisible electromagnetic waves to expel insects and rats, making them feel uncomfortableand flee away gradually. NIGHT LIGHT FEATURE This insect repeller provides a soft glow in the dark, and you could use the light switch to adjust the LED brightness, The intelligent night light of this pest repeller builds a stable and comfortable environment for you. EASY TO USE Just plug the pest control repellent into the socket without any tools. One ultrasonic pest repellent is effective for an area 15~30, there are 4 pieces in the package, Recommended to install this pest repeller vertically from 20-80cm awayfrom the ground. Please note that our ultrasonic repellents work between 3 and 4 weeks to make an effect depending on the amount of infestation. Then we can say goodbye to pests and mice. QUIET AND LESS POWER CONSUMPTIONUpgraded Ultrasonic 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. WIDE APPLICATION It's widely used in homes, warehouses, offices, gardens, hotels, factory, hospital, store etc. Effective for all Pests: spiders, mouse, insects, cockroach, mosquitoes, mice, fleas, Flies, ants, rats, roaches, bedbug, rodents. Recommendyou install one pest repeller for each room because the ultrasound cannot penetrate walls and solid objects. As for large storage area with vermin, we suggest install 2 or more devices.