• JUANSHI lung exerciser designed to increase resistance and improve lung capacity through restrictive breathing techniques. • Provides support to the respiratory system, facilitating mucus removal and promoting overall lung health. • Easily allows you to adjust the resistance level with a knob, adapting to each user's needs. • Portable and compact, ideal for training your lungs anywhere and anytime. • Made with high-quality materials that ensure durability and effectiveness during prolonged use. • Practical tool for those looking to improve their physical performance and respiratory health.