The stethoscope is identifying the heart blood pressure and other vital signs;

Vibration transmission between the principle of the stethoscope is material involved in the aluminium film of the stethoscope, and single than air, change of the voice frequency, wavelength, up to the human ear the scope of "comfort", at the same time has covered the other voice, "hear" more clearly.

People hear the sound of the reason is the so-called "voice" is vibration transmission such as air vibration material to each ear tympanic membrane, etc., into electrical impulses, one is "listen" to the sound. The human ear can feel the vibration frequency of 20-20 KHZ.

People feel is standard and a volume of sound, and wavelength is related to the intensity of the normal hearing range of 0 db, 140 db.

 Packing: 50PCS/CTN

Carton size: 52*38*42cm

N.W.:6kgs

G.W.:6.5kgs