Innovative X3R technology, unique to the IE 900, combines the German-made 7mm transducerwith specially developed membrane foil, triple-chamber absorber and acoustic vortex for anintense listening experience.Specific uses for product : Music Larger-than-life sound from 7mm TrueResponse Transducer, crafted in Germany specifically forin-ear listening using the entire frequency spectrum for critical hearing of all elements of the source Unique triple-chamber absorber system and acoustic vortex removes masking resonances for a refined and extended treble. Newly developed membrane foil minimizes resonances and distortion Equipped with para-aramid reinforced cables with gold plated MMCX connectors which possesses a special recessed and robust design to ensure reliability even after over 500 attachment cycles Selection of silicone and memory foam ear adaptors in 3 sizes (S/M/L) and adjustable ear hooks to ensure an optimal fit and high noise isolation Product includes: 3 connecting cables with MMCX connectors; single ended 3.5mm and balanced 2.5mm & 4.4mm, silicone & memory foam sets (S, M, L), carry case, cleaning tool and user manual 2-year warranty