There is a "bookshelf" function on the digital audio players that will play books stored on a USB drive inserted into the side of the player. Sometimes the drives are damaged because it sticks out at a 90 degree angle from the side.
Attaching the USB drive to the top of the recorder with strips of velcro keeps the drive with the player so it doesn't get lost. Then just use a length of connecting cable to one end of the drive that will plug into the side of the player. When it's time to transfer a downloadable digital book to the drive, it will be right there on top! Some example pictures are below.
The USB drive and connecting cable are attached
to the top of the player.