The AirPhysio Low Lung Capacity device is a drug free device designed for most teenagers and adults who don't have any severe lung conditions looking to improve their quality of life easily and without drugs and medication. The 1# Mucus Clearance And Lung Expansive Device To Naturally Improve Your Breathing. , , The device works to reduce breathlessness, especially for those complaining of short breath. It is approved by FDA as one of the best solutions to shortness of breath and a great exercise to develop a better breathing. The low device comes with two sizes of bearing balls.