The Lenovo ThinkPad Tablet 2 Dock with AC Adapter 0B47109 is a docking station specifically designed for Lenovo ThinkPad tablets. It allows users to easily connect their tablet to a dock, providing additional connectivity options such as USB, VGA, and Ethernet. The dock also includes an AC adapter for charging and powering the connected devices. This accessory is essential for users who want to expand the capabilities of their Lenovo ThinkPad tablet and enhance their overall productivity.