Contains 4 replacement butane cartridge and 12 replacement insect repellent mats for use with all Thermacell products. Each mat provides 4 hours of repellency. Each butane cartridge lasts for up to 12 hours. The Earth Scent repellent mats are designed to provide effective cover scent for hunting. Hang packaged. Thermacell products can NOT be shipped Air or International. Thermacell products repel mosquitos which may carry the Zika Virus, West Nile, Chikungunya, Dengue fever, and other mosquito-borne illnesses.