Yealink Microsoft Certified Teams Conference Phone, 5-inch multi-touch screen with 1280*720 resolution, Built-in Bluetooth 4.2 and dual band 2.4G/5G Wi-Fi, Optima HD voice, Full duplex technology, 20-feet and 360 degree voice pickup, Built in 12+1 microphone array, Android 11, Microsoft Teams Certified, Support USB Audio Device via Type C, IEEE 802.3af PoE support, without PSU”