Four adaptive microphones and proprietary DSP work together to reduce disruptive background noise. Six layers of WindSmart® technology ensure your voice comes through clearly. Wideband audio for high quality PC telephony and compatible smartphones. Smart sensors answer calls by simply putting on the headset and transferring calls between mobile phone and headset. Work seamlessly across smartphones, laptops, tablets and Bluetooth®-enabled desk phones. Activate Siri, Google Now or Cortana with the touch of a dedicated button. Enhanced voice alerts announce caller ID, mute, connection status and talk time level. Portable charging case with integrated docking stand provides up to 14 hours of additional talk time. Up to seven hours talk time and up to nine days standby.