"Optima HD IP Conference Phone • Wrapped with flannel • New UI • Linux • 4-inch multi-touch screen with 480x800 resolution • Optimal HD audio, full duplex technology • One wireless BT expansion Mic CPW25-BT-Single(Optional)(pending) • 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 with PSU"