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Lightmark is not only a bookmark, but also a light. It has a ＵＶ foaming resin technology, which is used to seal LED rapidly, and can be used as a diffusion film, so it is so thin that it can be used as a bookmark. When we read, we can still stick the Lightmark in the book. Bending the lamp-shaped part at the top of the device, and the light inside will turn on, so we can use it as a light. Unbending the device, and the light will turn off.