The 3M Littmann Electronic Stethoscope 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. These stethoscopes are lightweight and offer enhanced working life.