Mucus Relief Cleanser & Lung Expansion Device by Tilcare - Breathing Exerciser for Better Fitness & Sleep - Perfect Treatment Aid for COPD, Asthma, Bronchitis & Cystic Fibrosis - OPEP Flutter MachineOPEP technology used to remove mucus and strengthen lungs Oscillating Positive Expiratory Pressure helps to expand the lungs and aids with Mucus Relief, which will improve your overall health, fitness and provide better sleep. Easy to use This Lung Exercise Device does not require any batteries or refills, making it perfect for long term breathing problems or recovery assistance. Great for improving lung health This Breather Machine works to cleanse