Yealink Microsoft Certified Teams Conference Phone, 5-inch multi-touch screen with 1280*720 resolution, Built-in Bluetooth 4.0 and dual band 2.4G/5G Wi-Fi, Connect to PC via USB Micro-B port, Optima HD voice, Full duplex technology, 20-feet and 360 degree voice pickup, Two wireless microphones (optional), Built in 3-microphone array, Android OS, Supports Office 365, upgradability of firmware to Teams or SFB edition, IEEE 802.3af PoE support, without PSU