This is a ThermaCELL Mosquito Repellent Appliance Kit. The Mosquito Repellent Appliance is convenient to carry. Repels up to 98% of mosquitoes. Also effective against black flies, no-see-ums and other flying insects. Creates a 15 x 15-foot zone of bug-free comfort. Safe to use: does not contain DEET and has no open flames. Used for Camping, Hunting, Backyards, and Spectator Sports. This package contains one appliance, 3 repellent mats, and ThermaCELL cartridge.