3M Littmann Classic II S.E. Stethoscope, Smoke-Finish Chestpiece, 28", Dark Olive Green Tube, 2942 High acoustic sensitivity in a dual-sided chestpiece combines with durable, compact design to deliver versatile auscultation and rugged dependability Tunable diaphragm responds with a simple pressure change to capture low and high-frequency sounds without the need to turn over the chestpiece Anatomically designed headset is angled to meet the path of the ear canal and provide optimal listening.Care - Do not immerse your stethoscope in any liquid or subject it to any sterilization process Latex-free materials for allergy sensitive users Non-chill rim and diaphragm provide welcome patient comfort Double-sided chestpiece, for adult and pediatric auscultation Pediatric side can be converted to an open bell for low frequencies using non-chill bell sleeve (included) Pressure-based sound frequency adjustment with tunable diaphragm Parallel noise-reducing sound channels in the tubes