3M Littmann 28" Select stethoscope has a Tunable diaphragm in a Single-Sided, Coated Alloy Chest-Piece.

• Tunable diaphragm that allows the user to alternate between bell and diaphragm modes by applying simple pressure on the chest-piece.
• Reliable and clear acoustics offer an advantage to healthcare professionals when listening to heart, lung and blood pressure sounds.
• 2-year warranty.