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This $100 option turns the tablet into a full laptop, with a keyboard that is ThinkPad through and through.
The keyboard on the right is as good as many laptops, and the frame on the left is where the tablet plugs in for use in laptop mode.
Instead of the typical ThinkPad rubber trackstick, Lenovo has put an optical model on this keyboard. It moves a cursor that appears when touched, which is done by sliding the finger over the stick. There are two full mouse buttons for use with the trackstick.