This item is currently out of stock.
Most RVs only give you one 12V accessory outlet per location, which gets limiting fast once you've got a CB radio, phone charger, or other 12V gear all wanting power at once. This adapter plugs into a standard cigarette-style outlet and splits it into two receptacles, letting you run multiple accessories from a single plug.
It's an easy fix for anyone who's run out of 12V outlets and doesn't want to add a separate wired circuit just to power one more device.