The 3M™ Littmann® Master Classic II™ Teaching Stethoscope with its award winning ergonomic design, combines high performance and comfort on one side. And, with two headsets, black and burgundy, it allows the educator and student to perform simultaneous auscultation. The longer 40” length makes moving around patients easier. And, 3M’s ‘tunable technology’ in the diaphragm allows you to hear low and high frequency sounds by simply applying light or firm pressure to the chestpiece. Complement the classroom teaching with any of the tools from the 3M™(link) href="http://solutions.3m.com/wps/portal/3M/en_US/Littmann/stethoscope/education/learning-institute/"(/tag) Littmann® Learning Institute (/link).