The Black Flag 190095 propane fogger is small, lightweight and easy to operate with no electricity required. 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. This same effective system is used by professionals to kill mosquitoes that may carry the Zika virus or West Nile virus. In about 5 mins, the fog is gone so you can start enjoying the outdoors again. The fogger is ideal for backyard parties, camping and outdoor picnics. To operate, while outdoors fill the insecticide tank with Black Flag, Cutter or Repel branded insecticide, push the auto-start button to start fogger and let pre-heat for at least 2 mins. Keeping fogger upright and level, simply pump the trigger at the rate of once every 3 to 4 secs as you work your way around the outdoor area you wish to treat. An average sized space (5,000 sq-ft) can be treated in less than 10 mins. For outdoor use only.