Padding for isolating ambient noise. Clear high tones and consistently superior sound quality. Automatically switch between call mode and music mode. UNPARALLELED MUSIC & CALLING EXPERIENCE: Designed for music and calls, it can switch between call mode and music mode; Using industry-leading professional acoustic component—the Ole Wolff diaphragm, which provides a wider frequency response and higher sensitivity of music, enabling everyone to enjoy the full sound of originalities and fineness; With Yealink Acoustic Shield Technology, the two microphones block the background noise automatically but ensure participant voice be heard clearly.