- Increase lung capacity and endurance: a breathing trainer made of hypoallergenic silicone and robust plastic uses restrictive breathing technology to train your breathing muscles. Ideal for athletes, singers or smokers, it supports fitness, yoga or rehabilitation by improving vital capacity, cardio performance and fatigue resistance. - Adjustable resistance for personalized training: the resistance regulator adapts from beginner to professional levels, letting you gradually increase intensity to strengthen your lungs and sustain long-term progress. Daily use can show noticeable improvements. - High-quality, portable design: compact 3.86 x 2.24 inches in black, lightweight, odourless and travel-friendly. Safe, durable and easy to clean, suitable for on-the-go use, in the office or during workouts. - Health benefits and breathing efficiency: supports cleansing of the respiratory tract, helps release mucus and optimizes oxygen absorption. Particularly useful for asthmatics, swimmers or mountaineers seeking deeper, controlled breathing. - Use scenarios: - During cardio workouts to boost stamina and recovery. - In vocal warm-ups or practice for singers and performers. - In rehabilitation, travel, or daily breathing training to support airway health.