The 3M Littmann Lightweight II S.E. Stethoscope is an entry-level instrument known for its light weight and reliable acoustic performance. It features a tunable diaphragm and a dual-sided chestpiece, allowing users to hear both high and low-frequency sounds by simply adjusting the pressure on the chestpiece. The teardrop-shaped chestpiece is designed for easy positioning under blood pressure cuffs and around bandages.