The Mosquito Spray System is simple.  It consists of a timer, a reservoir and a motor connected to a series of stainless steel and brass nozzles.  The nozzles are mounted discretely under the eaves of your roof, on the perimeter of your fence and on copper risers within your landscaping.  The key ingredient emitted by the system is pyrethrum, an organic extract from chrysanthemum flowers.  Pyrethrum is low in toxicity, water based, biodegradable and never leaves a residue.