The AntiTrix is a makeshift replica of the Omnitrix's season 1 model, with the dial symbol turned red and appearing in half, resembling a letter 'K', and with the addition of four metal protrusions ending in red lights.
The AntiTrix is a DNA-Altering device, using contained alien DNA to transform the user into that species of alien.
The AntiTrix has a quick change feature, allowing Kevin to change forms by pressing the symbol on the aliens' chests.
AntiTrix Symbol Position
The AntiTrix symbol is generally located on the chest of the transformations.
The AntiTrix was, at some point, created by Kevin Levin, who gained the blueprints to the device in a dream. However, the boy arrogantly decided to make minor modifications to the device, making the aliens Kevin becomes somewhat different and more powerful than the normal variant, but also unstable.