Omega was created on Shadow Prime as a combat droid for use in war-time situations, until he succumbed to insanity. He roamed many deserts, murdering anyone who dared to cross him. Omega later on decided to give himself a name... The Butcher.
This is his headset/radio.
Here's how the head is attatched. Credit to NSSDForever for the neck idea.
Omega:"Stop trying to put me in Fight Club dammit! I may be insane but i'm not going up against Prometheus!"
Omega:"And you! Stop pointing that camara at me!"
Camara guy:" But it's my job to-"
Omega:"I don't care!"
Until next time, viewer!