Yealink CP925 , Optima HD IP Conference Phone , Wrapped with flannel , New UI , Linux , 4-inch multi-touch screen with 480×800 resolution , Optimal HD audio, full duplex technology , One wireless BT expansion Mic CPW25-BT-Single(Optional) , 20-foot (6-meter) and 360-degree voice pickup , Built-in 7-microphone array, 360-degree voice pickup , 5-way conference call , Built-in Wi-Fi 2.4GHz/5GHz, 802.11a/b/g/n , Built-in Bluetooth 4.2 , Local 3-way PSTN conference via Yealink CPN10