Original thermacell mosquito repellent refills effectively repel mosquitoes by creating a scent-free 15 ft zone of protection when used in fuel-powered thermacell repellers.Ideal for use while you are camping, hunting, fishing, gardening and around the backyard.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.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.Package contains- 3 repellent mats and 1 fuel cartridges.Dispenser Type: Heat VaporType: Refill Mat and ButaneSpecies: Mosquito, Black Fly, No-See-UmsQuantity: 1 Cartridge/3 MatsEffective Time: Up to 12 hrsScent Type: RepellentEffective Distance: 15 ftWick Capacity: 4 hrs per MatHeat Type: ButaneUv Protection: NoneContains: AllethrinHazair: Yes