ERKA MEMBRANE ERKA's Membrane construction includes an additional resonance chamber, which optimizes the sound. PAVILION The reversible double bell has a funnel-shaped open side specially designed for low-frequency auscultation. The diaphragm guarantees excellent auscultation of the full frequency spectrum. SPRING AND TUBE Thanks to the spring integrated into the tube, the acoustics of the horn are transmitted to the ear almost without loss. This avoids the frictional noise associated with two separate tubes. EAR TUBES The ergonomic, adaptable shape of the ear tubes guarantees perfect comfort. The default 15° inclined ear tubes adapt to the characteristics of the user's ear canal. EAR TIPS Ergonomically shaped, ultra-soft eartips adapt to the shape of the ear canal, providing great comfort and an excellent acoustic seal against ambient noise. 10-year warranty Ref : IBSTS15