I would like to carry more books on my device, which Boox e-reader has a SD card slot?

We are sorry to inform you that currently, our Boox e-readers do not have SD card slots. Boox devices have storage from 16GB storage to 64 GB storage, and you could choose one according to your needs. If you think that it is not large enough, you are suggested to use 3-party Apps, such as Google Drive, to carry more books if necessary. Alternatively, use a USB C hub to read memory card.