Positive Expiratory Pressure (PEP) therapy is used to mobilize secretions. PEP devices have been found to give independence to patients with chronic respiratory diseases as the therapy can be done when convenient for the patient and without the need for an assistant.

Acapella combines the benefits of both PEP therapy and airway vibrations to mobilize pulmonary secretions and can be used in virtually any position allowing patients to move freely and sit, stand or recline.