It looks like the Ultimatrix with a second faceplate.
It works just like any Omnitrix, by swaping the the user's DNA with the DNA of the selected species. It can fuse two species' DNA together to create powerful fusion aliens. It has every DNA sample from the unlocked Omnitrix. It cannot evolve aliens. It can transform you into one alien with just one faceplate or by selecting the same alien twice.
You select an alien on each faceplate and pressdown.