"Okay, well these devices are far more advanced than the one Jake has on his wrist," she said, leaving the room for a moment before returning with devices which looked almost identical to Jake's. "I know, but its the kit on the inside that makes them different. First though Jake you need to take your current kit off your wrist."<br/><br/>"But its keeping me out of the effects of the fracture, if I-"<br/><br/>"Jake, if the fracture had any effect on this house I wouldn't be here," Lena said, laughing. "Its surrounded by a much larger version of the time bubble within the device." As Jake took the device off his wrist Lena handed Hannah hers. "There are two main differences with these. One: these are genetically encoded to only work with whichever agent first wears them. It is possible to encode it for another agent but it takes a hell of a long time so its not a smart idea to try. Two: you see the big black button on its left side? Press it and the device becomes invisible to all but people who've travelled through the timestream, which should be almost no-one in the 1960s. Except maybe the people meddling with history anyway."