User Interface Features - 9,4 cm ( 3,7 inch ) screen with backlight Audio Features - Optima HD voice with Acoustic Shield and Smart Noise Filtering Basic Features - Up to 12 SIP accounts - PoE support - Stand with two adjustable angles, wall mountable Advanced Features - Wi-Fi via WF40/WF50, Bluetooth via BT41 - Support expansion modules - Support USB recording Connectivity - Dual USB ports, dual-port Gigabit Ethernet - Headset, EHS support