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*The interface diameter is about 45mm, good sound transmission effect . *Rotating shaft type double-sided stethoscope can be rotated 180°, large and small auscultation heads can be auscultated with flexible rotation and good positioning; *The big head is used for auscultation of the heart and lungs; the small head is used for localized fine auscultation. *The tube is made of PVC material, which has good cold resistance and is not easy to age and harden. *Earplugs are comfortable and soft .