Perfect Auscultatie through research and developmentPrecision double chest-piece with innovative membranen support.• Anatomically shaped binaural with internal multiple spring for adjusting the contactpressure.• Extra-soft, replaceable and pivotale ear-tips for perfect sealing at the ear canal andenhanced wear comfortInnovative acoustic system with extraordinary auscultation for all frequency ranges• Precision double chest-piece made of stainless steel or aluminium• Special membranen for precise acoustics, Ø 44 mm, with novel non-chill rims forimproved adaptation on the skin• Total length: 74 cm