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 you are camping, hunting, fishing, gardening and around the backyard, Thermacell Repellers have been evaluated by the EPA for safety and effectiveness. Lightweight, portable, no open flameWorks with all Thermacell repellent mats and refills.Up to 98 percent effective against mosquitoes, black flies and no-see-ums within a 15 x 15 feet areaNo deet odor-free, effective alternative to lotions and spraysCordless and portable unit is powered by butane so there is no need for plugs or batteries small enough to fit in your pocketRepels mosquitoes that could carry Zika and West Nile virusSmall enough to fit in your pocketEach unit comes with 12 hours of protection