This is a roll-able bluetooth keyboard. When the keyboard is rolled up, it looks like a pen. The stored keyboard is wrapped in a metal case, which expresses a sense of technology. When pulled the keyboard out with your hand, it is an ultra-thin transparent keyboard. The transparent film is made of a single piece of flexible sensor material, which can automatically rolled up and finally covered by the metal case through a motor. The appearance not only reflects the characteristics of Royole's new technology, but also perfectly integrates into the environment of mobile office.