This item is under development, and we we'll provide an ETA on its completion in March. If you pre-order it, we'll ship it later, separately from non-module items, and at our own expense. Please subscribe to our monthly newsletter, so we can keep you updated.
The trackball module attaches to the right keyboard half, it features excellent precision and usability, and is well-suited to be used by a thumb. Following is a demonstration of our trackball and key cluster module prototypes.