The Diagnostic Quality Dual head stethoscope has a wide frequency range and delivers a clear clean sound. . . . . . Our stethoscopes are precisely machined for exceptional performance and robust durability. ___ DIAPHRAGM: 45mm Bell 35mm Highly sensitive. . . , reduces external noise. . . .SPECS: OVERALL LENGTH:30 inches (76 cm) . . . . . WEIGHT: 176 grams (6.2 oz) ACCESSORIES Spare diaphragm 2 pairs ear tips small/large). . . . . . . . WARRANTY: 3 years. (30 day return).