Marc Ecko Unltd EKU-FRC-GLD Force Over-the-Ear Headphones (Gold) Noise-reduction stereo earphones with Mega bass iPod and iPhone compatible Includes satin carry bag 38mm speaker diameter Frequency response: 10Hz - 22kHz iPod/iPhone Compatible Stereo Headphones with Noise Reduction 38 mm speaker 32 OHMS Impendance 3.5mm Plug and 1.2M cable