Yealink T27g IP Phone No PSU GB (YEA-SIP-T27G) - Display And Indicator: 3.6-inch 240 x 120-Pixel Graphical LCD With Backlight, Feature Keys: 8 Line Keys With LED, Network And Security: SIP V1 (RFC2543), V2 (RFC3261), Dimensions: 265mm x 210mm x 170.5mm x 53.5mm, Audio Features: HD Voice, HD Handset, HD Speaker, Connectivity: Dual-Port Gigabit Ethernet, Power Over Ethernet (IEEE 802.3af) Class 3, 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