3M Littmann Electronic Stethoscope 3M Littmann Electronic Stethoscope is a technology advanced electronic stethoscope with sound analysis software offers amplification up to eighteen times greater than the best conventional Littmann stethoscopes. Superior acoustics combined with digital signal processing -- offering recording, storage and playback capabilities. Recorded sounds can be downloaded to an IBM-compatible computer and replayed allowing you to see, on the computer screen, exactly what you are hearing. Three frequency response modes - bell (20 - 200 Hz), diaphragm (100 - 500 Hz), and extended range (20 - 100 Hz). LCD display in chestpiece, including heart rate readout. Twenty hours of continuous use from two AAA alkaline batteries (included). Excellent acoustic seal and comfortable fit with patented 3M Littmann Snap-Tight Soft-Sealing Eartips. Comfortably angled, anatomically correct headset. Patient friendly, nonchill rim. Chestpiece sized for adult or pediatric patients. 2-year warranty. 27" L.