Safe and Eco-Friendly---No poisons, traps, chemicals and killing needed as safe and harmless to humans, children and pets. The ultrasonic sound is inaudible to humans and pets, no noise, no radiation, and pregnant women and babies can use it with confidence. Lightweight design and easy to use- --The ultrasonic pest repeller is portable and easy to install, just plug it into power outlets and make sure there are no barriers like curtains or cabinets covering in front of the repeller. The spider repellent plug-in works automatically and should take a few days to work effectively. Advanced Pest Control Technology---The ultrasonic insect repellent is equipped with the latest ultrasonic physical technology and a heat dissipation system. This mouse repellent emits different frequencies of ultrasonic waves to irritate the nervous system of various pests such as rats, mosquitoes, ants, cockroaches, spiders and more. Variety of uses and full coverage---Widely used in home, warehouse, office, garden, hotel, etc. Energy saving, protect you from pest intrusions all day long without worrying about your bill. Since ultrasonic cannot penetrate through walls and solid objects, it is recommended to put at least one pest repellant in a room. Excellent after-sales service---Please note that you can see results within 2-4 weeks, it is normal to see the pests increase in the first 2 weeks as they are repelled from their home. Reduction in pest activity should occur within 2-3 weeks.;