May be used in Thermacell MR300, Mini Halo and Perimeter mosquito control devices. Includes one gas cartridge and 3 mosquito control mats for roughly 12 hours of use. Familiarize yourself with the instructions for use. The empty Thermacell gas cartridge and mosquito control mat are disposed of as mixed waste/combustible waste in accordance with local guidelines. The mat is empty when the mat’s blue color fades. If the gas cartridges or mats have not been used completely, they should be disposed of as hazardous waste.