Steaming only; / Metal sleeve is in the “Up positionOnly hot steam will be injected into the milk. This is ideal for a latte. Steaming and Frothing / Metal sleeve is in the “Down positionThe metal cylinder sits tightly on the black frother tip. Hot steam and air are injected into the milk. The air will swirl inside the milk creating silky dense froth on top of the milk, ideal for a cappuccino.Tip: If you have enough froth on top of the milk and like to have the milk hotter, just move the cylinder up. Steaming and heating the milk will continue without additional frothing