Cardiology Classic offers acoustical excellence in a traditional design with superior durability. Its innovative features include: - stainless steel chestpiece (diameter 36-47 mm) with extra deep cone-shaped bell for a superb low frequency response - stainless steel double inner spring binaural - ultra-sensitive diaphragm for unsurpassed amplification - durable, elegantly moulded 40 cm (16") PVC tubing Manual and box in 11 languages: GB, FR, DE, IT, ES, PT, GR, PL, HU, SE, Arabic.