Outstanding acoustics with better audibility of high-frequency sounds (adult side, firm pressure)
Tunable diaphragm: hear high or low frequency sounds by slightly adjusting pressure on the chestpiece
Dual-lumen tubing: two sound paths in one tube eliminates the rubbing noise of traditional double tubes

Two-sided chestpiece with tunable diaphragms on both the adult and pediatric sides, Diaphragm Diameter: 1.7 Inch (4.3 cm) ; Small Diaphragm Diameter: 1.3 Inch (3.3 cm) ; Diaphragm Material: Epoxy/Fiberglass ; Diaphragm Type: Tunable, single-piece. Headset Material: Wide diameter aerospace alloy / Anodized aluminum
Single-piece tunable diaphragm is easy to attach, and easier to clean because its surface is smooth without crevices
Pediatric side converts to a traditional open bell by replacing the single-piece diaphragm with a non-chill rim

Outstanding acoustics with better audibility of high-frequency sounds (adult side, firm pressure) Littman stethoscope is preferred by many professionals around the world
Stethoscope by Littman features tuneable diaphragm: hear high or low frequency sounds by slightly adjusting pressure on the chestpiece
Two sound paths in one tube eliminates the rubbing noise of traditional double tubes, Littman stethoscope is worth the money