The troopers of the Imperial Guard, the Space Marines, Sisters of Battle, and members of the Inquisition have miniature Vox-casters built into the helmets of their armour. The Tech-priests of the Adeptus Mechanicus usually have Vox-casters implanted within their skulls as part of their cybernetic enhancements, a common upgrade for all the servants of the Machine God. Most of these Vox-casters are short-ranged and used only for intersquad communications.