[Improve exercise efficiency] : Enhance aerobic exercise endurance and increase lung capacity, enhance muscle endurance, resistance can be adjusted by circulation valve, portable and easy to clean
[High quality material] High quality silicone mouthparts, no odor, harmless for long-term use
To improve the efficiency of aerobic resistance training, a certain amount of resistance is applied during exhalation to avoid or reduce the early closure of the affected small airways and reduce the volume of residual air in the lungs