Pocket-size, silent and portable with no open flame. Goes everywhere providing a mosquito free zone around a deck, campsite, tree stand, turkey blind or small boat. Also great for backyards and spectator sports. Repels up to 98 percent of mosquitoes, black flies and no-see-ums over a 15'x15' area. Contains 1 reusable appliance, 1 butane cartridge (0.73 fl. oz.) and 3 insect repellent mats. Active ingredient: D-cis transallethrin 21.97 percent.