Feature 1Enhance Strength: Breathing trainer measures your lung capacity and breathing strength, providing data reference for your training, raising your anaerobic threshold. 2Improve Endurance: Breathing trainer tool can increase the performance of your lung muscles to improve exercise efficiency and endurance, regulate your breathing, anxiety, sleep, etc. 3Daily 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. 4Simple 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. 5Wide 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 LungsMaterial: Aluminum alloy, food grade plasticBattery Type: Lithium BatteryBattery Capacity: 320mAh (Include)Size: Approx. 140 x 22 x 12mm / 5.5 x 0.9 x 0.5inAdvantages: Improve Breathing Strength, Increase Lung Capacity, Enhance Anaerobic Threshold, Reduce Stress LevelsApplicability: Suitable for Adults, Elderly, Children, Swimmers, Athletes, Singers, etc. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Breathing Exercise Device2 x Replacement Mouthpieces1 x USB Cable1 x User Manual