MOSQUITO PROTECTION THAT WORKS: Thermacell effectively keeps mosquitoes up to 15FT away. Works fast, get max protection in 15 minutes. Easy to use. With a functional light feature, it’s ideal for nighttime recreation on the deck, by the firepit, and more. EFFECTIVE 15FT ZONE TECHNOLOGY: Engineered to precisely diffuse repellent, creating a 15-foot zone of mosquito protection. Consistent repellent protection won’t weaken over time. Powered by a safe and compact fuel cartridge. Independent light feature uses 3 AAA batteries (not included).