The spray is a gas-filled liquid that contains oxygen, carbon monoxide and propane.
It is sprayed onto the ground, creating an oxygen-rich mist that absorbs hot flames.
Firefighters can extinguish fires by using their hose to pull the flames away from the source of the spray, which will then be extinguished.
They will then use a special hose to extinguish the fire.
The process is quick and easy.
The aerosol sprays are designed to be inhaled and absorbed by the lungs.
Source: Supplied: NSW Fire and Emergency Services