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 devices DEET-free, scent-free, no spray, no mess Active ingredient is Allethrin, a synthetic version of a naturally occurring repellent found in chrysanthemum flowers Each repellent mat lasts up to 4 hours and each fuel cartridge lasts up to 12 hours 12-hour package contains 3 repellent mats and 1 fuel cartridge 48-hour package contains 12 repellent mats and 4 fuel cartridges 60-hour package contains 15 repellent mats and 5 fuel cartridges Manufacturers one-year limited warranty