The 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. 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. Package contains: 12 repellent mats and 4 fuel cartridges.Specifications and Features: Everything you need to keep your ThermaCell Mosquito Repellent Unit running Delivers hours of spray-free, invisible, and odorless protection from mosquitoes Kit includes 1 butane cartridge and 3 mats Fits all ThermaCell units