The audiobooks are being provided by Findaway World, which has a catalog of 40,000 titles. Findaway World is a well-known name in the library audiobook market; they're the makers of Playaway, a line of audiobook devices which can be checked out by patrons.
3M Library Systems will be debuting their new catalog additions next week at the annual Public Libraries of America conference in Indianapolis. They report that the audiobooks are compatible with all of the devices using 3M Cloud Library apps, which will be updated to support audiobooks. Users will not to bother with figuring out which formats work on which devices. Once the audiobook is checked out, users can immediately start listening.