ChoiceMMed lung trainer is designed for athletes, swimmer, singer who want improve the lung capacity and people suffering shallow breath. ChoiceMMed Lung Boost respiratory trainer strengthens your respiratory muscles to help you breath easily and breath more. Lung Boost lung trainer is a very simple using device: 1、Power on the device. 2、Chooose the training mode and pressure level by press the button. 3、Use your mouth to breath air with Lung Boost. 4、See your result on the display screen. Compared with other lung training device, ChoiceMMed LungBoost provide two smart training mode: endurance mode and strength mode. Endurance mode is designed to train your lung breath duration time. In this mode, you need to inhale or exhale as long as possible. Your lung effort level will be indicated by the number on the high-lighted ball on the screen. Strength mode is to designed to train your lung physical strength. By choosing this mode, you are required to inhale or exhale as hard as you can. ChoiceMMed LungBoost respiratory trainer has come with additional 3 free resistance cones. Each resistance cone could give 5 levels pressure. Totally LungBoost could provide 20 different pressure level for your choice. By purchasing a additional separate mouth piece, your family member could use one unit at home and save money.