Type: Earbud Driver Unit: 10mm Dynamic Micro Speaker Frequency Response: 20Hz–20KHz Input Impedance: 16 ohms Sensitivity: 95dB Cord Length: 4 feet Weight: 0.25 lbs. Features: Noise isolation minimizes external noises Engineered to present a balanced, clean sound you can enjoy for hours at a time Works with iPod, iPhone and other MP3 devices