First, we need to understand the types of lifebuoys and their functions. There are two main types of lifebuoys: propulsion lifebuoys and buoyancy lifebuoys. Propulsion lifebuoys can help drowning people to a safe place. The design of a propulsion lifebuoy usually includes a pole with a plastic handle and a standard lifebuoy. The handle can be shortened for easy control during rescue. When rescue is needed, we can throw the lifebuoy to the rescued person, and then pull it back through the handle of the pole to pull the rescued person to our location to ensure their safety and the safety of the rescuers.