The PrintBrush is a real product, not a concept and it can print an A4 size, in black and white, at up to 600dpi resolution. It uses Bluetooth and rechargeable batteries to print without any wires whatsoever. It is also capable of printing on any flat surface of your choice, which includes letters and fabric. This is made possible thanks to a built-in accurate optical sensor that can also detect tilt, rotation and translation. All I can say that the PrintBrush will be by far the smallest printer device in the world which can print full size formats. It will hit the market from early next year onwards for a price of $199. You can watch the demo of PrintBrush here.
Source : Crave