Black Flag Fogging Insecticide is specifically designed to be used with Black Flag, Burgess, branded thermal foggers. The secret to fogging is in the microscopic particles it produces, up to 7 times finer than mist. When applied before dusk or dawn, the fog floats and penetrates deep into landscaped areas where mosquitoes hide killing on contact and creating a mosquito-free zone that lasts up to 6 hours. In about 5 minutes, the fog is gone so you can start enjoying the outdoors again. Takes an average of 10 minutes to treat a 5,000 square foot yard. And the insecticide fog is nearly odorless! Use before backyard picnics, barbecues, outdoor parties and special events. This is the same effective system used by professionals to kill mosquitoes that may carry the Zika virus or West Nile virus. For outdoor residential use only.