Portable prison cell

Small enough to fit in the palm of a human hand, when thrown on the floor or the ground, the portable prison cell generated a force field around its "prisoner". It depended on a battery of some sort and used up the power within an hour. At least one of these was owned by Torchwood Three. (TV: Day One)
Category:Torchwood Three's items
Category:Defensive weapons
Category:Alien artefacts