Mosquitoes can disrupt outdoor activities like dining, parties, camping, or relaxing on your patio. Thermacell's award-winning technology keeps mosquitoes away by creating a 15FT protection zone around you. Our 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. 24 hours of mosquito repellent included. Only Genuine Thermacell refills are scientifically proven to work with Thermacell repellers to protect a 15FT zone. Fuel-powered refills containing Thermacell's proprietary formula are compatible with all Fuel-ZoneGuard repellers. Includes 6 4-hour DEET-free mosquito repellent mats and 2 12-hour butane fuel cartridges. Packaging may vary. PEOPLE & PET FRIENDLY: Independently tested and EPA reviewed for safety & effectiveness. Scent-free, no smoke. 100% SATISFACTION GUARANTEE: To return for repairs, replacement or refund, please contact service@thermacell.com.