Yealink T21p E2 HD IP Phone POE (YEA-SIP-T21P/E2) - Display: 132 × 64 Pixel Back Light LCD, Network And Security: Sip V1 (Rfc2543), V2 (Rfc3261), External Yealink Ac Adapter: Ac 100~240v Input And Dc 5v/600ma Output, Feature Keys: 2 Line Keys With LED, 6 Features Keys, Audio Feature: HD Voice, HD Handset, HD Speaker, Connectivity: 2 X Rj45 10/100m Ethernet Ports, Power Over Ethernet (Ieee 802.3af) Class 2 (T21p E2), 1 X Rj9 (4p4c) Handset Port, 1 X Rj9 (4p4c) Headset Port, Wall Mountable