Littmann Electronic Stethoscope Model 2000 Benefits Four times (400%) the amplification (15-20 dB) of the best conventional stethoscopes makes indistinct sounds easier to hear Filter circuitry provides enhanced clarity and three frequency response modes for optimal heart and lung auscultation: Bell (20-200 Hz), Diaphragm (100-500 Hz), Extended Range (100-1,000 Hz) Easy-to-use ergonomically designed chestpiece. Virtually as light as the 3M™Littmann™ Master Cardiology stethoscope Excellent acoustic seal and comfortable fit with patented 3M™Littmann™ Snap Tight soft-sealing eartips Comfortably angled, anatomically correct headset Patient-friendly, nonchill rim One-year warranty Volume control provides stepless adjustment to preferred levels 40 hours of continuous use from one AAA alkaline battery Alloy Chestpiece sized for adult or pediatric patients Tube Color: Black Length: 27" (69 cm)