Water based flea fogger kills flea eggs and fleas for up to 7 months. Also works on cockroaches, spiders, ants, ticks, and more. Keeps killing cockroaches for up to 6 months. Includes (2) 2 ounce foggers per pack. Safe for pets and people to return 2 hours after use. Each fogger covers 2000 cubic feet. Non-staining. Active ingredient: Esfenvalerate & Nylar.