Application: Help patients who have undergone abdominal or chest surgery to improve breathing depth and duration;
Helps restore lung breathing, reduces and prevents postoperative complications;
Improve dyspnea, shortness of breath and chest tightness;
Can be used for vital capacity exercises;

Features: No upside down: you can practice exhaling;
Two separate valves: set the impedance according to personal conditions, from easy to difficult, sequentially to difficult;