Original Thermacell Mosquito Repellent Refills effectively repel mosquitoes by creating a scent-free 15-foot zone of protection when used in fuel-powered Thermacell Repellers. Ideal for use while you are camping hunting fishing gardening and around the backyard.Features: Includes 120 hours of mosquito protection refills For use in fuel-powered Thermacell Repellers Lanterns and Torches Each repellent mat lasts up to 4 hours and each fuel cartridge lasts up to 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 Package contains: 30 repellent mats and 10 fuel cartridges