FANVIL V65 - 20 LINE WI-FI IP PHONE WITH GIGABIT PORTS, 45 DSS KEYS System: Linux Main Screen: 4.3-inch 480*272 Color Screen (IPS) DSS Keys: 45 SIP Lines: 20 Antibacterial Surface Local Phone Book: 2000 Audio Conference: 6-way local conference Wideband codecs: G.722,Opus Narrowband codecs: G.711, G.723.1, G.726, G.729A/B, iLBC USB: USB Type A x 1 ，Connect with USB Headset & USB Bluetooth: Bluetooth 4.2 WiFi: Built-in 2.4GHz & 5GHz PoE: Yes Network: 10/100/1000 Mbps EHS: Yes IPv6: Yes