Electronic Stethoscopes 3M™ Littmann® Electronic Stethoscope Model 3100 exceptional sound capabilites deliver an exceptional auscultation experience. Clinical evidence show that, it is easier to detect difficult-to-hear heart sounds like S3 gallops and aortic regurgitation murmurs, as well as abnormal lung sounds. Here's why: • Ambient Noise Reduction Technology: It cancels out, on average, 85% of ambient background noise that can interfere with the auscultation experience, without eliminating critical body sounds. • Acoustic Seal Eartips and Tubing: They create an excellent acoustic seal. It means a tighter seal from ambient noise entering through tubing and eartip connections. • State-of-the-Art Sound Sensor Positioned at the base of the tubing, the sensor brings the sound more naturally to your ears. • Up to 24X Sound Amplification