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 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. The fogger is ideal for backyard parties camping and outdoor picnics. Keeping fogger upright and level simply pump the trigger at the rate of once every 3 4 seconds as you work your way around the outdoor area you wish to treat. An average sized space (5 000 square feet) can be treated in less than 10 minutes. For outdoor use only.