AirPhysio uses oscillating positive expiratory pressure, or OPEP, to naturally improve your breathing. The user holds the AirPhysio mouthpiece close to your mouth and exhale. AirPhysio creates positive pressure within your lungs as you exhale. This pressure helps loosen mucus from the airway's walls and allows you to breathe out the mucus naturally. You'll breathe more easily, and experience clearer, more easy breathing. https://ipsnews.net/business/2021/10/26/airphysio-inhaler-reviews-opep-device/