Littmann Electronic Stethoscope
The 3M Littmann Electronic Stethoscope Model 3000 allows you to tune out the room when you turn up the volume. 3M?s new Ambient Noise Reduction technology reduces distracting room noise by an average of 75% (- 12 dB) over the bell and diaphragm operating range. Combine that with amplification up to 18 times greater than the best non-electronic stethoscope and there's less chance you'll miss the sounds you need to hear
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.