Breathing Lung Trainer: Crafted from ultra-flexible silicone, features a unique dual valve system for personalized resistance levels and secure neck strap design, providing comprehensive training for users of all types. Unique Dual Valve System: Experience consistent airflow with customizable resistance for balanced inhalation and exhalation control, providing a balanced and effective workout for your respiratory system. Secure Neck Strap Design: Ensuring effective breathing enhancement across multiple activities, the design reduces worries about breathing trainer falling off, allowing you to fully concentrate on your workout. Portable & Easy to Use: Designed for your convenience, the compact and lightweight Spectent lung trainer is effortless to carry and use anywhere, allowing you to easily incorporate sports into your daily routine.