This is the breathing muscle trainer that uses resistance to strengthen muscles used to optimize airflow. A five-minute routine consisting of only 30 breaths, twice a day, helps build stamina, boost vitality, and reduce blood pressure. Eleven adjustable levels help you improve over time via an easy-to-read resistance level indicator. The ergonomic design and comfortable mouthpiece encourage you to stick with the routine and achieve measurable results. Light or medium resistance.Suitable for all people- low resistance, rehabilitation of lung functions for patiently with respiratory illness or child between 6-19 years old.- medium resistance, healthy people(20-80 years old) or regular smokers.- heavy resistance, professional athletes at all levels of competition.Easy to CleanAs the breathing trainer will be exposed to saliva during use, please don't share it. Even with your family numbers. Clean it every time after use. Once a week, soak it in a mild cleansing solution for about 10 minutes.What's in the BoxBreathing trainerMouthpiece( grade TPE-latex free,PHT free )Nose clipHanging bandStorage pouchInstruction for use. Package:1pcAttention: Low resistance, medium resistance, and heavy resistance are applicable to different groups of people. When placing an order, please note the required resistance according to the description. If there is no note, we will default to sending medium resistance suitable for ordinary people.