The metro .Fi100V combines an in -line microfone and control button for hands – free convinience with superior sound quality , allowing users to listen to their music and talk comfortably. Designed to fit the unique Apple IPhone headset jack (and other mobile phones with same headset jack), the METRO . FI 100V also features a fabric cord for tangle free storage . The METRO . FI 100V s Comfortable in – ear design provides noise isolation that reduces ambient interference and enhances quality of sound.