Featuring a two-sided chestpiece, the Littmann Classic II SE stethoscope offers high acoustic sensitivity for superior performance. The Classic II SE’s tunable diaphragm on one side augments the traditional bell function of the opposite side. The Littmann Classic II S.E. stethoscope offers a traditional bell combined with a tunable diaphragm that allows the user to conveniently alternate between low- and high-frequency sounds without turning over the chestpiece. This stethoscope has a 3 years manufacturers warranty.