Six layers of our unique WindSmart® technology detect wind direction and respond accordingly so your voice comes through clearly ?especially outdoors. Supports HD Voice over wideband networks and devices to enhance speech quality, so your caller clearly hears and understands you. 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. Activate Siri, Google Now, or Cortana with the touch of a dedicated button on the headset. Automatically detects whether or not it?s being worn, directing call audio where you expect to hear it. Announces the names of incoming callers and waits for you to say ?Answer? or ?Ignore?, allowing you to manage your calls using voice commands. Up to 7 hours of non-stop talk from a single charge ?and up to 9 days in standby mode. Bluetooth version 4.1 with extended mobile range of up to 98 feet/30 meters. Locate your lost headset, change languages, or personalize settings and alerts with Plantronics Hub, our free mobile app. Recharge on the go with the optional Voyager 5200 charging case and docking stand for up to 14 extra hours of power (two full back-up charges).