Getting Started With the 3M™ Littmann® Electronic Stethoscope Models 3100 and 3200 - YouTube
Medi-Care Products - 3M™ Littmann® Electronic Stethoscope Model 3200 combines Ambient Noise Reduction technology and frictional noise dampening features with amplification, Bluetooth® technology, and an all-new user interface, for the next level
3M Littmann 3200 Electronic Stethoscope - Black for sale online | eBay