Features: 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 5?10 minutes per day and start training with 3?5 sets per day 4Breathing Training: Breathing trainer effectively increases resistance on respiratory muscles to improve efficiency and endurance with correct usage within 45?60 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 Trainer Material: Medical acrylic Size: Approx. 13 x 3 x 1cm / 5.12 x 1.18 x 0.39in Battery: 5V lithium battery 200mAh (built in) Package Included: 1 x Breathing Trainer 4 x Replacement Inhalation Nozzle 1 x USB Cable 1 x Instruction Manual