Quote from Stuart in the episode Spoiler: Corn is Delicious
Denise: Look, this one came with instructions. Stuart: Oh, really? Denise: And a warranty. Stuart: "Congratulations on your purchase of an interdimensional transport device." Ooh, it's got Bluetooth. Denise: Now, I don't understand. If Bert and Barry took the device, how is there another one? Stuart: Uh, let me look. "Don't use near water." "Caution. Small parts, choking hazard." Okay, here we go. "This is a quantum echo of the original device. It both exists and does not exist. And when activated, it will merge with the original device." Denise: You know, I'm just gonna stop asking questions. Let's go.