First custom earphone in the world with a single 14mm dynamic driver couples with advanced frequency suppression technology (FST). Frequency Response: 10-20000 Hz Impedance：16ohms（including cable） Sensitivity (at 1kHz)：116dB spl (1mW) Important: Due to the size of the driver, people with small ears may not be able to fit. We would need your ear impressions to check for sizes...
Fits iPod and iPhone earbuds (those included in the original Apple retail packaging). Simply snaps into place on your earbuds. Fits most BlackBerry® and other manufacturers' standard earbuds. Always keeps your earbuds available at shoulder height. One Year Limited Warranty