The Metro.fi 100v offers all the superior sound quality and noise isolation of the Metro.fi 100 and adds an in-line microphone and control button for hands-free convenience allowing users to listen to their music and talk comfortably. Designed to fit the unique Apple iPhone headset jack (and other mobile phones with this same headset jack), the Metro.fi 100v also features a fabric cord for tangle free storage. The form factor is small and lightweight providing excellent comfort and fit. Through it's comfortable in-ear design, the Metro.fi 100v provides noise isolation that reduces ambient interference and enhances quality of sound. Accessories include three sizes of silicone ear tips: small, medium and large, as well as a pocket ready hard carrying case. Product specifications are 10mm Mylar speaker, 103 dB SPL/mW at 1kHz input sensitivity, 17 Ohms nominal impedance, 46 inch cable length, 1/8 inch (3.5mm) stereo plug, 20 Hz-15 kHz frequency response, and 16 dB of noise isolation with omni directional microphone.