From Terra Nova Wiki
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Plexpads require a promethium core to function which have a finite limit before they burn out and need to be replaced. The plexpad can be used to display a wide variety of information from medical data to entire books and other media such as music. Biobeds have associated plexpads that can be used to remove data from the bed to be displayed elsewhere and examine things in more detail. (Within, Nightfall)
Both Josh and Maddy Shannon brought their plexpads with them to Terra Nova and their cores of their plexpads burned out. Dr. Elisabeth Shannon used a Biobed plexpad to show Hunter Boyce the Taroca parasite that had infested his intestines. (Within, Nightfall)