Feature: 1. Strengthen Respiratory Muscles: Breathing training device uses resistance to strengthen respiratory muscles, alleviate breathing difficulties, and improve overall health and vitality. 2. Increase 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. 3. Easy 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 4. Breathing Training: Breathing trainer effectively increases resistance on respiratory muscles to improve efficiency and endurance with correct usage within 45‑60 days. 5. Widely Used: Suitable for yoga enthusiasts, gym goers, sedentary individuals, people with respiratory difficulties, singers, and people looking to achieve a slimmer waistline. Specification: 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 List: 1 x Breathing Trainer4 x Replacement Inhalation Nozzle1 x USB Cable1 x Instruction Manual