The Thermacell MR-GJ Portable Mosquito Repeller effectively repels mosquitoes, black flies, and other biting insects by creating a 15 x 15-foot zone of protection for bug-free comfort. Ideal for use while gardening and around the backyard, Thermacell Repellers have been evaluated by the EPA for safety and effectiveness. Lightweight, portable, no open flame. Works with all Thermacell repeller mats and refills. Includes: Thermacell Garden Repeller, 3 Original repeller mats, 1 butane cartridge.