Yealink T23g GB IP Phone (YEA-SIP-T23G) - Display: 132 x 64-Pixel Graphical LCD With Backlight, Feature Keys: 3 Line Keys With LED, 5 Features Keys, 6 Navigation Keys, Dimensions: 209mm x 188mm x 150mm x 41mm, Management Configuration: Browser/Phone/Auto-Provision, External Yealink AC Adapter (Optional): AC 100~240V Input And DC 5V/600ma Output, Audio Features: HD Voice: HD Handset, HD Speaker, Connectivity: Dual-Port Gigabit Ethernet, Power Over Ethernet (IEEE 802.3af) Class 2, 1 x RJ9 (4P4C) Handset Port, 1 x RJ9 (4P4C) Headset Port, Wall Mountable