From the seller

One of our most popular acoustic scopes, the 603 combines outstanding acoustic performance with rugged durability, now with AFD technology! The Adscope® 603 series features: Combination diaphragm/bell adult chestpiece precisely machined to exacting tolerances from surgical stainless steel for outstanding performance and rugged durability ADC’s AFD technology provides enhanced acoustic response Light pressure for low, bell-type frequency, firm pressure for high, diaphragm-type frequency Extra large bell (1 3/8" diameter) for unsurpassed low-frequency response Ultra-sensitive diaphragm (1 3/4" diameter) for greater amplification and crisper high-frequency response Non-chill bell and diaphragm retaining rims for patient comfort Clinician headset boasts reinforcing yoke molded into the flexible 22" PVC tubing and stainless-steel binaurals fixed at 15º angle for greater comfort (tactical, copper, and iridescent models have aluminum binaurals) Tubing is soft and flexible and has been made without phthalates since 2014 Adsoft™ Plus silicone eartips with new snap-on connection for the ultimate in wearing comfort and acoustic seal Includes accessory kit with two pairs of spare Adsoft™ Plus eartips Scope ID tag included Weighs 5.8 oz. (164 g) Overall length 30"