LD Systems IE HP 2, 1-Eay In-Ear Headphones, Suitable for all wired- and wireless in-ear systems, Frequency range: 20 - 18,000 Hz, Impedance: 32 Ohm, Cable length: 1.55 m, 3.5 mm Stereo jack, Includes 3 pairs each of silicone and foam ear tips as well as a transport case