Cheapest Medical 3 Balls Spirometer (Breathing Trainer)" is a high-quality respiratory training device designed to help improve lung function. Our factory produces this product using the latest technology and premium materials to ensure durability and a long-lasting operation. It comes with three colored balls that move up and down according to the user's breath, indicating the level of air flow. This breathing trainer is ideal for people who suffer from respiratory conditions such as asthma, COPD, or bronchitis, as well as those recovering from surgery. It's easy to use, portable, and the perfect tool to keep your lungs healthy. Order now and experience the benefits of our world-class product!