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*State-of-the-art sound sensor
*Reduces 85% of ambient background noise
*Up to 24X sound amplification
*Proprietary Ambient Noise Reduction (ANR) Technology reduces on average 85% of unwanted background noise up to 24x sound amplification.
*Power on/off, bell/diaphragm/extended range frequency, and (+) and (-) buttons to adjust sound level up or down.
*LCD interface advises you of current sound level, and if you are in bell, diaphragm, or extended range frequency mode.
*3M Littmann patented soft-sealing eartips in 2 sizes.
*Stethoscope stays in battery-saving "sleep mode" until you start your next auscultation.
Requires 1 AA battery (Not included).
Made in USA2 year warranty

3M Company