Connects to either a PC or Yealink desktop IP phone via the USB3.0 port or via the built-in Bluetooth Yealink Acoustic Shield Technology Crystal speakerphone DECT connectivity for wireless operation Busy light on headset shows when in use DECT base station with 4.0 inch (480 x 800) capacitive touch screen USB hub built into the base station Built-in Bluetooth 4.2 Integrated with Yealink IP phones Boom arm adjustable: 320° Charging stand (for headset)