Etymotic Research Black ER5-BLACK 3.5mm Connector hf5 High-Fidelity Earphones Type: Earbud Frequency Response: 20Hz-15KHz Input Impedance: 16 ohms Sensitivity: 105dB S.P.L. at 1KHz Cord Length: 4 ft. Weight: less than 0.5 oz Parts: 1 year limited Labor: 1 year limited