Etymotic Research Black ER5-BLACK 3.5mm Connector Earbud Headphones and Accessories Type: Earbud Frequency Response: 20Hz-15KHz Input Impedance: 16 ohms Sensitivity: 105dB S.P.L. at 1KHz Cord Length: 3.0 feet - 5.0 feet Weight: less than 0.5 oz Parts: 1 year limited Labor: 1 year limited