Feature 1Strengthen Respiratory Muscles: Breathing training device uses resistance to strengthen respiratory muscles, alleviate breathing difficulties, and improve overall health and vitality. 2Increase Lung Capacity: Increase breath strength and train your diaphragm, which with a light effect progress bar, our device enhances respiratory muscle strength and lung capacity. 3Easy to Use: Lightweight and portable, which can be used anytime, anywhere. It is recommended to wear it for 510 minutes per day and start training with 35 sets per day 4Breathing Training: Breathing trainer effectively increases resistance on respiratory muscles to improve efficiency and endurance with correct usage within 4560 days. 5Widely Used: Suitable for yoga enthusiasts, gym goers, sedentary individuals, people with respiratory difficulties, singers, and people looking to achieve a slimmer waistline.Item Type: Smart Breathing TrainerMaterial: Medical acrylicSize: Approx. 13 x 3 x 1cm / 5.12 x 1.18 x 0.39inBattery: 5V lithium battery 200mAh (built in) .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 Trainer4 x Replacement Inhalation Nozzle1 x USB Cable1 x Instruction Manual