Thermacell Repellent Refills 48 Hour Pack Thermacell Max Life Mosquito Repellent Refills effectively repel mosquitoes by creating a 15-foot zone of protection when used in a Thermacell Repeller. Each Max Life mat lasts 12 hours, 3X longer than original Thermacell mats, so you replace mats less frequently. Features: 48 hours of mosquito protection refills For use in fuel-powered Thermacell Repellers, Lanterns, and Torches Each Max Life mat lasts 12 hours - 3X longer than original Thermacell mats - so you replace mats less frequently. Fuel cartridge lasts 12 hours No spray and no mess. Scent-free and DEET-free Active ingredient is Allethrin, a synthetic version of a naturally occurring repellent found in chrysanthemum flowers Max Life repellent mats are longer than Original Thermacell Refills, but fit into all fuel-powered Thermacell Repellers Package contains: 4 Max Life 12-Hour repellent mats and 4 fuel cartridges