Ultimate Ears UE RR+; Custom made 3-way high-end studio reference earphones for mixing and mastering, bass driver, midrange driver, treble driver, 3-way passive crossover, perfect fit through ear fitting (impression from hearing aid acoustician required), high attenuation of 26dB, interchangeable cables through plug-in system, hard inner ear part, frequency response 5 - 18,000 Hz (+/- 2dB), 5 - 25.000 Hz (-12dB), efficiency:122 dB @ 1 kHz, 100 mW, impedance 50 Ohm, design: transparent with white faceplate with UE logo, connection cable selectable 121 or 164 cm, incl. case with engraved name, jack adapter 3.5 mm > 6.3 mm stereo jack, cleaning tool and attenuation adapter for impedance adjustment, note: unique technology, top class in design and sound, also suitable for studio use e.g. for mastering