Ultimate Ears UE 250; 2-way in-ear headphones with ergonomic fit; 2-balanced armature drivers (1x bass, 1x mid/tweeter); bass-emphasised sound; suitable for musicians with bass instruments; frequency response: 5 Hz - 22 kHz; impedance: 22 Ohm; efficiency: 103 dB / 0. 1V RMS; noise isolation: up to -26 dB; exchangeable cable (length: 127 cm) 3.5mm mini jack to IPX (Estron T2, IP67); colour (earpiece): Transparent with silver glittering, black faceplate, (cable): black; Scope of delivery: silicone ear tips (XS, S, M, L), foam ear tips (S, M, L), cleaning tool, carrying case