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It is green and looks like a wristwatch. It has a faceplate that resembles an hour glass along with two long flat buttons on the side. If the user presses down on both buttons and twists the faceplate will pop up to show holograms.
The Omnitrix can replace the DNA of it's user with the DNA of any other species in the known galaxies as long as their DNA is stored in a planet known as Primus. It is also known to have the ability to restore DNA of corrupted beings (E.g. DNAlien humans).