The T420 is a Business Class laptop has a docking station connector on the bottom. It has the Legendary ThinkPad keyboard; this one has a better keyboard than the newer ThinkPad's starting with the T430. These laptops are much better than your average consumer class laptop. This T420 has the Intel I5-2520 CPU, 4G of ram (Expandable), a 320G hard drive (an SSD can be substituted), and the larger 9 sell battery. Has a fresh load of Windows 10 Pro, currently updated with all Window 10 updates. Comes with original Lenovo 90W AC Adapter. Price: $250.