The 445HD IP phone is an entry-level model designed to offer the essential everyday features that the modern business environment demands. Full duplex speaker phone and headset connection 4.2" high-res display (480 x 272 pixels), 6 multimedia keys, 4 soft keys, PoE or via optional external AC adapter, Dual GbE and USB headset support, Integrated dualband WLAN and Bluetooth. Native SIP phone Can only be used with Microsoft Teams via the SIP gateway or a connected SBC!