3M LITTMANN 3100 Electronic Stethoscope BRAND NEW, Never used Several units available FEATURES: The 3M™ Littmann® Electronic Stethoscope Model 3100 delivers both exceptional sound quality and a simple-to-operate user interface. With these sound and usability improvements, you might never go back to your old stethoscope. Proprietary Ambient Noise Reduction Technology (ANR) Reduces background noise 85% on average without eliminating critical body sounds 13% better ANR than previous models Acoustic Seal Eartips Patented 3M™ Littmann® Snap Tight Soft-Sealing Eartips provides a comfortable fit and excellent seal Creates a tight acoustic seal from ambient noise entering through eartip connections State-of-the-Art Sound Sensor Built to stringent specification Sound experience equivalent to Littmann® cardiology-grade acoustic stethoscope The sound received from the sensor is transmitted naturally to ears through the tubing Frictional Noise Reduction Technology Helps reduce handling noises compared to previous electronic models Less distracting than previous models Lets you focus on critical sounds Up to 24X Sound Amplification Extra listening power for when you need it Helpful when a heart, lung or body sound is especially faint May be useful for overly obese patients May be helpful when the patient's clothing restricts your listening experience