This 4-pack of Indoor/Outdoor Mosquito Repellent Lantern Refills by Safer is designed to keep mosquitoes away with a repel/deter control method. Made of plastic and powered by batteries, these gray lanterns provide 12 hours of prevention for outdoor use. The EPA registration number 59913-14 ensures its effectiveness, and it is pet safe for added convenience. Ideal for camping, hiking, and other outdoor activities, this device and refill pack is a must-have for anyone looking to enjoy the outdoors without the pesky mosquitoes. Made in the United States, this product offers a reliable solution for a mosquito-free outdoor experience.