Cutting Edge Noise Cancelling: Features four microphones and a proprietary DSP that work together to cancel disruptive background noise like traffic or crowds.Exclusive WindSmart Technology: Six layers of our unique WindSmart technology detect wind direction and respond accordingly so your voice comes through clearly -especially outdoors.HD Voice Clarity: Supports HD Voice over wideband networks and devices to enhance speech quality, so your caller clearly hears and understands you.All Day Comfort: Rigorously tested for stability and comfort on a wide range of ear shapes, so it feels as comfortable on your last call of the day as it did on the first.Talk Time: Up to 7 hours of non-stop talk from a single charge and up to 9 days in standby mode.