Lenovo ThinkPad One Link Dock (4X10A06077) One Link delivers data, driver-free video, and power through a single convenient connector Front Panel: 2x USB 3.0 (One with Always-On Mobile Device Charging) - Ideal for use with memory keys, hard drives and other quick access devices. Stereo / Mic Combo Audio Port Rear Panel: 2x USB 2.0 - Ideal for most USB devices, including printers, keyboards, and mice. HDMI, Gigabit Ethernet (10/1000), DC PowerThinkPad One Link Dock Compatible for ThinkPad X1 Carbon 2nd Generation (Machine Types 20A7, 20A8) and ThinkPad X1 Carbon 3rd Generation (Machine Types 20BS, 20BT)