Premium dual-sided Bluetooth stereo headset optimized for Microsoft Lync features an ultra noise canceling microphone large leatherette ear pads up to 15 hours talk time multi connectivity from PC and mobile phone calls voice prompts for status iPhone battery meter Sennheiser voice clarity ActiveGard hearing protection technology and automatic music setting for relaxing between calls. Includes headset dongle USB charging stand safety guide InCompliance leaflet and quick guide.