The Uber-IDS is a device similar in function to the Inter-Dimensional Shift Device, IDS Receptacles and IDS Batteries, though physically much larger. Though not explicitly explained, it appears to be able to shift a much larger area to an alternate dimension than the handheld IDS Device, possibly the entire world.
The Uber IDS Device apparently has a fail-safe feature which in case of a malfunction, will transport the user of the Uber IDS to a pocket dimension where they would be safe.