Marc Ecko Unltd EKU-PLS-RD Pulse Over-the-Ear Headphones (Red) Noise-reduction stereo earphones with strong bass response iPod and iPhone compatible 40mm drivers for powerful sound reproduction Frequency response: 20Hz - 20kHz Includes satin carry bag iPod/iPhone Compatible Stereo Headphones with Noise Reduction 40 mm speaker 32 OHMS Impendance 3.5mm Plug and 1.2M cable