4x10/100Base-TX Ethernet ports (PoE ports) and 1x10/100Base- TX up-link port. Support IEEE802.3af/at standards, Max. 30W output of single port. 1~4 downlink ports can only communicate with uplink ports,extend transmission distance up to 250m(10Mbps). 6KV surge protection, 8KV ESD immunity and anti-interference. Easy and safe installation: wall-mounting, desktop, Kensington security slot, Plug-and-play.