The OFF! Backyard Mosquito Lamp Refills by Johnson are designed to provide 12 hours of prevention against mosquitoes outdoors. The pack includes 2 diffusers and 2 candles, all made of plastic and powered by batteries. The liquid form of the repellent is specifically formulated to deter and repel mosquitoes, making it an essential addition to any outdoor activities such as camping and hiking. Its outdoor use ensures a bug-free experience while enjoying the great outdoors.