The Littmann Classics set the standard for clinical use and the Classic III features many beneficial upgrades that enhance acoustic sensitivity. Light pressure on the diaphragm allows the user to hear lower frequency sounds, firmer pressure allows you to hear higher frequency sounds. The 3M Littmann Classic III Stethoscope has a dual head and high acoustic sensitivity. The 3M Littmann Classic III Stethoscope has a tunable diaphragm on both the adult and paediatric sides of the chestpiece. The single-piece diaphragm is easy to attach and easy to clean because the surface is smooth and without crevices. Paediatric side converts to a traditional open bell by replacing the single-piece diaphragm with a non-chill sleeve. The chestpiece is precision machined into an aesthetically pleasing, less angular shape. The 3M Littmann Classic III Stethoscope comes with a 5 year warranty.