Lambda cyhalothrin 5% EC is a type of insecticide that belongs to the pyrethroid class of chemicals. It works by targeting the nervous system of insects, disrupting their normal function, and ultimately leading to their death. Lambda-cyhalothrin binds to and activates voltage-gated sodium channels on the surface of insect nerve cells. This causes the channels to open, allowing an influx of sodium ions into the cells. The influx of sodium ions leads to a depolarization of the cell membrane, which triggers a series of nerve impulses that ultimately cause paralysis and death in the insect.