Completely portable, this lightweight propane-powered fogger is the most economical way to kill mosquitoes and biting flies. The secret to fogging is in the microscopic particles it produces, up to 7X 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 hrs. In about 5 mins, the fog is gone so you can start enjoying the outdoors again. Takes an average of 10 mins to treat a 5000 sq-ft yard. 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. The BURGESS 1443 propane fogger features a 40 oz reservoir and requires a standard propane cylinder (not included). Also has a trigger lock prevents accidental dispensing of insecticide. For better results, use only with Black Flag, Cutter or Repel branded Fogging Insecticides. For outdoor residential use only.