Lenovo Black 4X10E52935 ThinkPad OneLink Pro Dock - port replicator Ports Spec: Interface Provided 4 x SuperSpeed USB 3.0 1 x Headset / headphones / microphone 2 x 4 pin USB Type A Type: Hi-Speed USB Connector Type: 20 pin DisplayPort Interface: DisplayPort Type: Audio / video Connector Type: 29 pin combined DVI Interface: DVI-Analog/Digital (dual link) Connector Type: RJ-45 Interface: Ethernet 10Base-T/100Base-TX/ 1000Base-T Type: Network Weight: 2.55 lbs.