Laptop docking station external interfaces lan rj45 usb 20 audio out audio in kensington lock slot usb 30 video output hdmi usb 20 ports 2 usb 30 ports 2 lan standard gigabit ethernet 101001000 mbits compatible with lenovo thinkpad edge e431 lenovo thinkpad edge e531 lenovo thinkpad s531 lenovo thinkpad s440