A revitalising unit was a piece of Cyber-technology that allowed Cybermen to recharge their systems when their power levels ran low. It consisted of two components. The first resembled a large, rectangular sarcophagus with an emblem mimicking the Cybermen's facial features on front. Inside was a cast big enough to accommodate the larger Cyber-Controller. The door was hinged at the right and opened outwards. The second component was a projection device, essentially an obelisk about seven to eight feet high with a trident shaped section on top. This section could pivot up and down and bombard the first component with energy that revitalised the occupant.