Yealink WH67 Convertible Microsoft Certified DECT Wireless Headset. With Yealink Acoustic Shield technology, the conference headsets could well filter out background noise by 2x microphones while you are on a call,which provides a HD voice quality for your listeners, and ensures distraction-free conversation. To meet various preferences of users, Yealink created the WH67 DECT headset with a lightweight design, and 4 wearing styles, as well as different sized ear tips to ensure all-day comfort.