Cisco UC520-24U-4BRI-K9. Management protocols: SNMP, Data link protocols: Ethernet, Fast Ethernet. Authentication method: RADIUS, SSID, EAP. Dimensions (WxDxH): 445 x 356 x 89 mm, Weight: 6.6 kg. Power requirements: AC 120/230V, 50/60 Hz. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 10 - 85 %