Geared to help children use their metered dose inhalers and optimize medication delivery, this unit helps target medicine to the lungs, and prevents spraying of inhalers to the back of the throat. Features a clear mouthpiece that enables the cargiver to see valve movement to better coordinate timing of medication actuation. Valve can be easily cleaned or replaced so the chamber can last longer. A convenient warning whistle will alert you if you are breathing too fast.