ADC Adscope 615 Platinum Professional Clinician Stethoscope with Tunable AFD Technology, 30.5 inch Length, Dark Green Adjustable frequency design (AFD) provides the acoustic response of a traditional bell and diaphragm into a convenient one-sided chestpiece. Oversized, sculpted ovoid chestpiece is CNC precision-machined from lightweight zinc alloy plated with an attractive satin finish, enhancing both acoustic performance and ergonomics. Clinician headset features reinforcing yoke molded into flexible 22-inch PVC tubing, stainless binaurals, and Adsoft Plus silicone eartips for the ultimate in wearing comfort and acoustic seal. Includes two additional pairs of Adsoft Plus eartips and a complimentary scope ID tag. Lifetime warranty and free "consumables," including diaphragms and eartips, when registered.