This respiratory exerciser has been specially designed for people who suffer from respiratory or pulmonary diseases.They will be able to regulate their own breathing exercises depending on the intensity required. Mild intensity: 1st ball up.Moderate intensity: 1st and 2nd ball up.Maximum intensity: 1st, 2nd and 3rd ball up.The 3 containters, the balls and the tube with mouthpiece are made of non-toxic materials. Besides, its functioning is based on techniques of respiratory kinesiology or incentive inspirometry so that patients who suffer from chronic bronchitis, pulmonary emphysema and COPD in pre- and post-operative periods can restore and enhance their lung capacity.How to use it?-Connect the tube with the mouthpiece to the base of the device.-Before using it, wash the mouthpiece with hot water and dry it by shaking it.-For gentle exercise, breathe in until the first ball floats and the rest remain on the base.-Keep the ball elevated for 3 seconds.-Release the mouthpiece and exhale