The Thermacell 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 camping, hunting, fishing, gardening, and around the backyard, Thermacell Repellers have been evaluated by the EPA for safety and effectiveness. Lightweight, portable, no open flame. Includes: Thermacell Olive Repeller, 3 Original repeller mats, 1 butane cartridge. Also includes one single pack refill. Batteries not included.