The Omni-Scrambler attached to the backpack of a Vanguard Infiltrator's Mark X Phobos Power Armour.
An Omni-Scrambler is a tool of electronic warfare deployed on the back pack of the Mark X Phobos Power Armour worn by Vanguard Infiltrators.
Omni-Scramblers are capable of intercepting Vox signals across a broad spectrum, scrambling frequencies and shutting down enemy communications while the Vanguard Space Marines infiltrate enemy lines on missions of sabotage and assassination.