POLY VVX 250 4-Line IP Phone and PoE-enabled. Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Lines quantity: 4 lines. Display: LED, Display diagonal: 7.11 cm (2.8"), Display resolution: 320 x 240 pixels. Voice codecs: G.711, G.722, G.722.1, G.729ab, OPUS, iLBC. Ethernet LAN interface type: Gigabit Ethernet, Ethernet LAN data rates: 10,100,1000 Mbit/s, Security algorithms: 802.1x RADIUS, HTTPS