Thermacell Fuel Cartridge Refills - The Thermacell Cartridge Refill effectively repels mosquitoes by creating a 15-foot zone of protection when used with ThermaCELL devices and ThermaCELL Repellent Mats. Use this Fuel-only refill for when you have spare ThermaCELL Repellent Mats. Features This 4-pack provides up to 48 hours of use in Thermacell Mosquito Repellers Fuel-only refill, repellent mats not included For use in fuel-powered Thermacell Repellers, Lanterns, and Torches Can be stored for long periods of time Package contains: 4 fuel cartridges each lasting 12 hours