The Thermacell mosquito repeller cartridge and mat refill pack effectively repels mosquitoes by creating a 4.5 meter zone of protection when used in a Thermacell Repeller. This refill pack containing 3 repellent mats and 1 fuel cartridge will last 12 hours total and is compatible with all Thermacell repellers, lanterns, and torches. Thermacell products are safe, effective, and come with a 100% satisfaction guarantee.