QPD-501 is a “smart book” device, integrating e-book, Internet and documentation functions. The 10.1 inch multi touch screen allows comfortable viewing and intuitive use. The input methods include handwriting, virtual keyboard and a detachable keyboard. Users can easy use it as notepad, to edit documents direct on the screen, instead of printing. With 0.8 kilogram weight and twelve millimeter thinness it is easy to carry. The folded paper like shape adds a human touch on the sleek one-piece cut exterior, made of aluminum alloy. It reduces great the numbers of moulds needed, making it more economic and environment friendly.