Description: Features: 1.Auscultation head: made of aluminum alloy thin sheet auscultation head is 14.4 mm, diaphragm 47 mm in diameter, effective diameter of 40 mm. Auscultation interface with ultra-thin fiber vibration membrane, the amplification effect on the heart and lung sounds, and can detect the high frequency noise, oblique mouth flat shape auscultation head is easy to insert sphygmomanometer arm bands (table).Very suitable for measuring blood pressure. 2.Ears hang: ears hang group by chrome plated aluminum alloy tube (5 mm in diameter), have been assembled and spring steel slice with PVC earplugs.Spring steel piece using manganese steel piece, with the hand can adjust freely according to different face sizes.Soft ear plugs and ear kiss close union, soft and comfortable, of the middle ear bone won't create oppressive feeling. 3.The leading tone (leading note) tube: Y's leading tone (leading note) tube is 580 plus or minus 10 mm, use PVC material, not easy fracture, anti-aging, no viscosity, high density, and contains no allergic emulsion composition. Specifications: Color:Black Material: aluminum alloy, PVC Specification: 70 cm Package Include: 1 x Medical single-head stethoscope