Yealink WH66 Mono Microsoft Certified DECT Wireless Headset. The Yealink WH66 DECT wireless headset is the newest addition to Yealink’s ever-expanding headset portfolio. By using DECT wireless technology, the Yealink WH66 offers great coverage and audio quality. 2 x Microphones Single earpiece Up to 10 hours talk time USB 3.0 port Bluetooth 2 port USB hub 4” Colour touch screen Handsfree speakerphone 2.5mm port Easily connect to a PC or Yealink IP phone Mobile phone wireless charger (optional)