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This product is a breathing trainer designed for children with asthma. Considering the frequent occurrence of asthma symptoms in children, this product hopes to help children add some fun while doing rehabilitation training, to minimize the discomfort caused by disease.
The product is coated with a layer of temperature-sensitive material on the inner wall of the transparent shell, which is colorless and transparent under normal conditions. The user can gradually change its color by breathing, and finally form a complete pattern after one training session.