CB PCO Fogger with Pyrethrins effectively removes all cockroaches, fleas, ticks, houseflies, mosquitoes, moths, wasps, crickets, or silverfish within the confines of the fumigated area. This product contains natural based pyrethrins making it ideal for use in sensitive areas such as homes, schools and hospitals. Pyrethrins are a completely natural pesticide (derived from the Chrysanthemum flower) that work by attacking the central nervous systems of bothersome pests on contact, causing death. Use one 5 oz. unit for 5,000 cubic feet of unobstructed space. Packaged in 5oz cans.