There have been three notable changes to The NDLR hardware since it was released in 2018.
The first release of The NDLRs had smooth turning (non-detended) encoders. There was a limited number of units made with a blue faceplate available to our Kickstarter backers. The majority had a black faceplate.
The second change was NDLRs with detented (clicky) encoders, and lower pressure buttons to reduce the clickiness.
The third change is the currently shipping as of October 2023 revision 2 The NDLR. It is easily identifiable by its red powder coated base, vs the gray/blue base of the original. The rev 2 The NDLR also has a soft-power button on the back that the original did not have.
The rev 2 The NDLR uses a different processor, and therefor different firmware than the original.