are a pair of related synthetic compounds used in insecticides
. They are synthetic pyrethroids
, a synthetic form of a chemical found naturally in the chrysanthemum
The compounds have low toxicity for humans and birds, and are used in many household insecticides such as RAID as well as mosquito coils. Insects subject to its exposure become paralyzed (nervous system effect) before dying.
They are also used as an ultra low volume (ULV) spray for outdoor mosquito control.