1Breathing Therapy: Breathing exercise device is a simple, safe and effective breathing monitoring tool to improve lung health and quality of life. 2Inspiratory Muscle Trainer: Breathing trainer can be used to improve respiratory muscle strengt h and endurance, allowing you to breathe easier, improve athletic performance and accelerate recovery. 3Accurate Measurement: Professional respiratory monitoring tool with precise and clear scale and value, which is safe and reliable. 4Widely Used: Suitable for sports teams, professional athletes, respiratory therapists, fitness centers, fire departments and sports medicine facilities. 5Safe Material: Made of durable material, not easy to break, does not contain any harmful substances, can be used for a long time and improve the lung capacity.