PoE Class 2 Swiveling graphic color display, 4.3" (480*272 pixels) LED background lighting (white) Signaling LED (red/green/yellow) 5 context sensitive soft keys with LED (red/green/yellow) 2 fixed function keys (menu/out-of-office) 4-way navigator, plus OK key 3 audio function keys (mute/loudspeaker/headset) with LED Volume +/- Open listening / hands-free (full duplex) Headset interface (DHSG/EHS) 10/100/1000 Base-T Ethernet switch IEEE 802.3az Energy Efficient Ethernet IEEE 802.3af Power over Ethernet, Class 2 Bluetooth 2.1 BR/EDR and Bluetooth 4.1 LE (dual mode device) NFC, interface for SD card Key Module 600 optional (max. 4), wall mounting