Behringer SD251-CK, Dynamic in-ear monitoring earphones, 6.8 mm Driver, Impedance: 22 Ohm, Frequency response: 20 - 20000 Hz, Maximum level: 105 dB, Cable length: 1.6 m, 3.5 mm Stereo jack plug, Colour: Black, Includes gold-plated 6.3 mm adapter, foam and silicone ear tips in 3 sizes, storage case