Thermacell Repeller Mat Max Life Refill Paperboard 2" high 4" wide Max Life Refill pack includes 48 hours of mosquito protection refills Each Max Life mat lasts 12 hours  3X longer than original Thermacell mats  so you replace mats less frequently. Fuel cartridge also lasts 12 hours. 15-foot mosquito protection zone For use in Thermacell Repellers, Lanterns, and Torches. Turn it on Mosquitoes Gone! Scent-free and DEET-free Active ingredient is Allethrin, a synthetic version of a naturally occurring repellent found in chrysanthemum flowers 100% Satisfaction Guarantee on all Thermacell products Package contains: 48 hours of refills - 4 Max Life 12-Hour repellent mats and 4 fuel cartridges