Ultimate Ears UE-18+ Pro, 4-Way High-end InEar Earphones, Unique technology, top class in design and sound, also suitable for studio applications such as mastering, With 6 drivers: 2-way bass, 2-way mid-range, 1-way mid / high driver, 1-way high frequency, Complete pressure chamber driver, 4-Way passive crossover, Perfect hold due to ear adjustment (imprint required by the hearing healthcare professional), High attenuation of 26 dB, Replaceable cables by plugging system, Hard inner tube, Multi-coloured on request, Frequency response: 5 - 22,000 Hz, Sensitivity: 100 dB @ 1 kHz, 100 mV, Impedance: 37.5 Ohm @ 1 kHz, Incl. Metal case with engraved name