This USB Mini Dock A/V Network Port Replicator for ThinkPad from Lenovo features six USB ports, three video ports, an RJ-45 Ethernet port, and analog microphone in, and headphone out audio ports. It's ideal for ThinkPad users who need quick, easy access to the Internet/LAN, multiple USB devices, and audio and video equipment. An integrated key lock and cable lock slot physically secure the ThinkPad (not included) to the Mini Dock, and the Mini Dock to a desk, table, pole, furniture, etc. in the workspace. This product is compatible with the ThinkPad L412, L420, L512, L520, T400s, T410, T410i, T410s, T410si, T420, T420s, T510, T510i, T520 Dual Core models, and X220 laptops.