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ThinkPad Tablet 2 by Lenovo
The Tablet 2 is part of a modular system to fully leverage the utility of the slate. This photo shows the tablet used in the Wireless Keyboard, a Bluetooth accessory that turns the Tablet 2 into a laptop on the go.
The keyboard charges via microUSB and connects wirelessly to the ThinkPad Tablet 2. In place of a trackpad, the keyboard has a trackstick-like nub in the middle of the keyboard. This nub is operated via touch and with a little practice is actually pretty good. It works in conjunction with the 3 mouse buttons on the near side of the keyboard.
The keyboard is available from Lenovo for $119.99 which is fairly expensive.