Features 100% new high quality Original 5 PORT PCI ETHERNET SWITCH 4 EXTERNAL PORTS. 10/100Mbps Auto-Negotiation RJ45 ports supporting Auto-MDI/MDIX. Supports IEEE802.3x flow control for Full Duplex mode and backpressure for half-duplex mode. Supports MAC address auto-learning and auto-aging. LED indicators for monitoring power, link, activity. External Power Adapter supply.