Yealink T42s Gb IP Phone (YEA-SIP-T42S) - Display And Indicator: 2.7-inch 192x64-Pixel Graphical LCD With Backlight, Feature Keys: 6 Line Keys With LED, Dimension: 212mm x 189mm x 175mm x 54mm, Network And Security: SIP V1 (RFC2543), V2 (RFC3261), Connectivity: Dual-Port Gigabit Ethernet, Power Over Ethernet (IEEE 802.3af) Class 2, 1 X USB Port (2.0 Compliant), 1 X RJ9 (4P4C) Handset Port, 1 X RJ9 (4P4C) Headset Port, 1 X RJ12 (6P6C) EHS Port, Wall Mountable