See the flash demonstration for more information about the new Littmann® Electronic Stethoscope Model 4100WS, which has the same functions as the Model 4000WS, but with one significant difference; the Model 4100WS now incorporates 3M's new Ambient Noise Reduction technology.
This technology reduces distracting room noise by an average of 75% (-12dB) over the bell and diaphragm operating range. This stethoscope is uniquely equipped to help you pick up difficult-to-hear heart, lung and other body sounds even when the world around you is filled with distracting noise.
How Ambient Noise Reduction (ANR) works:
The proprietary Ambient Noise Reduction technology internal to the chestpiece, acoustically cancels out an average of 75% of distracting room noise, greatly enhancing overall utility. This acoustic effect is different from electronic filtering, which may also filter out some portions of body sounds clinicians need to hear.
Please note the flash demonstration may take a few moments to download and become fully operational.