Sennheiser IE 500 Pro CL, In-Ear Monitoring Earphones, Assertive in-ear monitoring sound with extremely fine resolution, Impedance: 16 ohms, THD at 1kHz: <0.08%, Frequency range: 6 - 20000 Hz, Attenuation: <26db, Sound pressure level at 1kHz: 126 dB (1kHz / 1 Vrms), Cable length: 1.3 m, Weight: 18 g, Colour: Clear, Includes 3 silicone earpieces (S, M, L), 3 foam earpieces (S, M, L), transport case, cleaning tool, 1 6.3 mm jack adapter