Thermacell's award-winning technology keeps mosquitoes away by creating a 15 Ft. protection zone around you. The proprietary formula precisely targets mosquito sensors, driving them away. With consistent protection that doesn't weaken over time, Thermacell helps you live your best outside life without the use of bug sprays or lotions on your skin. Powered by a safe and compact 12-hour fuel cartridge. 12 hours of mosquito repellent included.