The 3M Littmann Electronic Stethoscope Model 3200 has proprietary Ambient Noise Reduction (ANR) technology that cancels out, on average, 85% of ambient background noise that can interfere with the auscultation experience. Stores 12 thirty second tracks onboard the stethoscope, along with a 10 second comment to notate the sound. Snap tight soft-sealing eartips provide a comfortable fit and a tighter seal from ambient noise. State-of-the-art sound sensor provides a lifelike sound experience similar to a high-end cardiology stethoscope. Frictional noise reduction technology helps reduce handling noises compared to other stethoscopes. Up to 24X sound amplification. Rugged design for years of trouble-free operation.