Black Flag Outdoor Fogging Insecticide, 64 oz, Pack of 3 For use with Black Flag, Burgess, Cutter, and Repel branded thermal foggers Ready to use - no mixing required and no offensive odor Kills and repels mosquitoes and biting flies for up to 6 hours The same effective system used by professionals to kill mosquitoes Everyone can enter the treated area as soon as the fog disperses (typically less than 5 minutes)