A Patented Tunable Diaphragm And Superb Craftsmanship Offer The Ultimate Performance In A Superior-Single Sided Stethoscope Meets The Exacting Standards Of Health Care Professionals Who Demand The Highest Acoustic Response. Features Patented Littmann Snap Tight Soft-Sealing Eartips, Patient-Friendly, Nonchill Rim And Diaphragm And Special Procedures Adapter. Seven-Year Warranty, Plus Lifetime Service And Repair Policy.