It was first mentioned by Azmuth in Map of Infinity. He was planning on giving it to Ben, but it was not complete yet along with Ben's maturity needing to increase before he could use it.
Azmuth by the events of The Ultimate Enemy: Part 2 had finished making it and claimed that he was working on it ever since Ben got the prototype (approximately six years). In the same episode, he gave it to Ben because he deemed him worthy.
Unlike other post-Unitrix models, it does not rely on the Codon Stream for transformation, instead having the DNA stored within itself in a computerized form, although it might still be connected to Primus for practical reasons.
It is also updated with new aliens.
It has a holographic interface, where a holographic circle is shown, with the top half having alien faces, which is activated and scrolls through the aliens by the user touching the faceplate, akin to a touch screen. The faceplate will then slide open when the side button is pressed to lock in the selection, the Omnitrix Core will come out and when pressed will trigger a transformation.