Jake's transmaterializer has been set up to sync the flow of time between his and Jade's universe and hence not cause time shenanigans, suggesting that under normal circumstances, that it could target any point in the timeline, like a Sendificator and Appearifier. Both Jake and Roxy are not aware that they are sending items into an alternate instance of their universe. Jake believes he is working with his Grandma from a time when she was a teenager herself, and Roxy believes she has taken Jaspers from a younger version of her mom.