Lenovo 4X90E51405 Thinkpad USB 3.0 Ethernet Adapter for Compatible Lenovo Models 4X90E51405 Lenovo Genuine Retail Factory Sealed ThinkPad USB 3.0 Ethernet Adapter. Features Lenovo Full size RJ45 connector, LEDs on connector to indicate connection status Two LEDs on RJ45 port for power and data transfer indication. Green for power and Yellow for activity. Booting from LAN and loading image from remote server both on legacy BIOS and UEFI BIOS system QoS (Quality of Service) tagged packets and duplicate address detection. Does Not support POE(Power over Ethernet) Giga bit speed when running on USB3.0 environment 100M/10M adapt when running on USB2.0 environment . Ethernet receptacle (L x W x H) 53 mm x 15 mm x 16 mm, Cable (L x D) 80 mm x 3.5 mm , Approximate height 3cm, Approximate width 5cm, Approximate length 18cm.