Thermacell Original Mosquito Repellent Refills are for use in fuel-powered Thermacell repellers, lanterns, and torches. Each no spray, no mess, and DEET-free insect repellent mat lasts up to four hours by creating a scent-free 15-foot zone of protection. Enjoy your fishing time (and other outdoor activities) without the biting bugs! Resupply your Thermacell devices with original Thermacell Mosquito Repellent Refills. Mosquito protection for use in fuel-powered Thermacell devicesDEET-free, scent-free, no spray, no messActive ingredient is Allethrin, a synthetic version of a naturally occurring repellent found in chrysanthemum flowersEach repellent mat lasts up to 4 hours and each fuel cartridge lasts up to 12 hours12-hour package contains 3 repellent mats and 1 fuel cartridge48-hour package contains 12 repellent mats and 4 fuel cartridges60-hour package contains 15 repellent mats and 5 fuel cartridgesManufacturers one-year limited warranty