• The multi-functional breathing trainer is a multi-purpose device designed to improve lung volume and build endurance during exercise. It has an adjustable resistance, allowing you to customize the intensity of the training according to your needs. • This product is made from quality materials, including silicone and ABS, which provide both durability and comfort in use. Its black color gives it an elegant and modern appearance. • The multifunctional respiratory trainer allows you to develop your lung capacity and improve your performance during physical activities. Whether you are an athlete looking to improve your performance or simply someone who wants to improve your respiratory health, this respiratory trainer offers you a practical and effective solution.