The Littmann Master Classic II set the standard for clinical use and the Master Classic II features many beneficial upgrades that enhance acoustic sensitivity. The 3M Littmann Master Classic II Stethoscope has a tunable diaphragm that allows to hear high or low frequency sounds by slightly adjusting pressure on the chestpiece. The soft-sealing eartips provides an excellent acoustic seal and comfortable fit. Headset is easily adjusted for individual fit and comfort. It has an angled eartubes align with ear canals. The non-chill diaphragm and rim provide patient comfort. The 3M Littmann Master Classic II Stethoscope comes with a 3 year warranty which includes free repair on any manufacturing or material defects.