1、Enhance Strength: Breathing trainer measures your lung capacity and breathing strength, providing data reference for your training, raising your anaerobic threshold. 2、Improve Endurance: Breathing trainer tool can increase the performance of your lung muscles to improve exercise efficiency and endurance, regulate your breathing, anxiety, sleep, etc. 3、Daily Use: With increasing light effect and direct reading on the screen, it makes training more interesting, you can view the data of the last 5 lifetimes, pay attention to health. 4、Simple Use: Inhale slowly through your mouth, as deep as possible. Hold your breath for a few seconds. Slowly exhale through your mouth until you are completely out. 5、Wide Application: Deep breathing lung exercisers are small in size and easy to carry, which is suitable for adults, the elderly, children, swimmers, singers and so on. Item Type: Breathing Exercise Device for Lungs Material: Aluminum alloy, food grade plastic Battery Type: Lithium Battery Battery Capacity: 320mAh (Include) Size: Approx. 140 x 22 x 12mm / 5.5 x 0.9 x 0.5in Advantages: Improve Breathing Strength, Increase Lung Capacity, Enhance Anaerobic Threshold, Reduce Stress Levels Applicability: Suitable for Adults, Elderly, Children, Swimmers, Athletes, Singers, etc. 1 x Breathing Exercise Device 2 x Replacement Mouthpieces 1 x USB Cable 1 x User Manual