From the blog "The Wall"

Tim YuSprint 4G Rollout UpdatesDecember 11, 2017 - 9:30 PM PST Recently, individuals who ordered Magic Boxes noticed a change in the product code of the unit to AU544 from AU545.  It is now confirmed that the product code change is due to the release of the 3rd generation Magic Box.  They are now being shipped! The new revision is in essence a GEN2 optimized with a high quality LCD touchscreen display like that of the 1st Generation AU540. In addition, an external battery pack with an