CHOICEMMED Lung Boost Electronic Smart Lung Exerciser - Lung Strengthener for Improving Lung Capacity - Replacement for Altitude Mask, Breathing Bag - Underwater Exploration and Instrument Breathe Trainer

EASY TO USE: Our lung exerciser device has simple to use electronic technology and makes lung capacity training and elevation training a breeze ; it also imitates a breathing bag for diving or instrument training EASY TO READ: The Lung Boost breathe trainer is a good replacement for a high elevation training mask has a large screen display with incentive driven visuals making training interesting and fun MULTIPLE TRAINING MODES: Our breathing exerciser has two training modes , endurance and strength , making your lung training sessions more effective