Screen : Monochrome display ? 3.2 inches x 2.2 inches (8.2 cm x 5.5 cm) Lines : 1 Networking : Gigabit Ethernet (10/100/1000) line interface, Second Ethernet interface 10/100/1000 Mbps Voice Codecs : G.711, G.722, G.726, G.729ab Quality Of Service : Network Protocols : HTTP, (VoIP) H.323, SIP Features : 8 buttons with dual LEDs (red, green), 4 softkeys, 24 administrative buttons, Full duplex speakerphone, ergonomic hearing aid compatible handset Power Supply : PoE Class (IEEE 802.3af) Dimensions : N/A Weight : N/A