Advanced Ultrasonic Mouse Technology: The Ultrasonic Rodent Repeller uses ultrasonic waves to affect the brains of pests and drive them out of your home. Ultrasonic rodent repellents work effectively without chemicals or toxins. Versatile rodent repellent: Ultrasonic rodent repellent to repel mice, cockroaches, spiders, insects, mosquitoes, insects and ants. You can only use this ultrasonic repeller for many pests without using other traditional mosquito traps. Wide coverage ultrasonic repeller: The spider repeller covers up to 115 square meters. We recommend one unit per room for best results, as ultrasonic sound can be affected by walls or solid objects. This ultrasonic spider plugin is suitable for home, office, hotel, restaurant, attic,... Simple to use repeller: just plug the spider repeller into appropriate outlet and unplug it to activate this indoor repellent. Rodenticides work automatically and take days to work effectively.