Feature: 1. Improve Lung Health: Smart Breathing Trainer is a portable lung capacity exerciser designed to strengthen your respiratory muscles. It helps improve lung capacity and overall lung health, making it ideal for athletes, singers, divers, and anyone who wants to enhance their breathing abilities. 2. Personalized Training: With adjustable resistance levels, you can customize your training according to your fitness level and goals. Breathing trainer allows you to gradually increase the difficulty, helping you build endurance and stamina over time. It is suitable for beginners and advanced users alike. 3. Strengthen Respiratory Muscles: Regular use of the trainer helps strengthen the muscles involved in breathing, including the diaphragm and intercostal muscles. By exercising these muscles, you can improve respiratory efficiency, endurance, and control, leading to better overall lung function. 4. Compact and Lightweight: Lung capacity training device is compact and lightweight, making it easy to carry and use anytime, anywhere. Whether you are at home, in the office, or on the go, you can conveniently incorporate lung exercises into your daily routine. 5. Easy to Use and Monitor: Lung capacity training device is simple to use, with a user friendly interface and intuitive controls. The built in monitor accurately displays your breathing progress, allowing you to track your training sessions and monitor improvements over time. Specification: Item Type: Breathing Trainer Material: Plastic Battery Type: Lithium ion Battery 320mAh (Shipped with Built in Battery) Product Size: Approx. 140 x 22 x 12mm / 5.5 x 0.9 x 0.5in. Package List: 1 x Breathing Trainer 1 x User Manual 2 x Mouthpiece 1 x USB Cable