Yealink SIP-T31W. Product type: IP Phone, Product color: Gray, Handset type: Wired handset. Lines quantity: 2 lines, Phonebook capacity: 1000 entries. Display: LCD, Display diagonal: 2.3", Display resolution: 132 x 64 pixels. Voice codecs: AEC, AGC, AJB, G.711, G.711a, G.722, G.723.1, G.726, G.729, G.729A, G.729B, G.729ab, VAD, iLBC. Ethernet LAN interface type: Fast Ethernet, Ethernet LAN data rates: 10,100 Mbit/s, Wi-Fi standards: 802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)