Introduction: breathing trainer is is a kind of physiontherapy aid to restore normal breathing,which can effectively help patients with respiratory impairment after chest and abdomen operation.The product is portable,simple and easy to use.It is an inspiratory muscle training device for improving the strength and stamina of the muscles used to breathe in.It can help patients to recover normal breathing after a chest or abdominal surgery, It is also a common recommendation to COPD patients. ApplicationIt is Applicable to the recovery of pulmonary respiratory funtion in patients with decreased pulmonary fucaiton caused by thoracic and pulmonary diseases,surgery,anesthesia and mechanical ventilation.Reduce and prevent postoperative pulmonary complications.It use for postsurgical patients, COPD patients, regular smokers, healthy people or athlete. Features:1 Small and Light Design for Easy Handling and Cleaning2 Soft and Skin-friendly Medical Grade Silicone Mouthpiece 4 0 Leaning Cost ONLY 5 Minutes to Learn and Master5 Strongly Improve Dyspnea and Quality of Life After 4 weeks training6 Drug-free Method No Side Effects or Drug Interactions Performance:Spring ResistanceThe device uses a variable load calibrated spring, calibrated to your chosen resistance. It can be adjusted from the lowest load setting when you begin training and increased as your breathing muscles adapt and become stronger.The standard unit used to measure breathing resistance is cmH20, which is short for Centimeters of water.