The ADC-V723 is a 1080p Outdoor WIFI camera. Mounting to a single-Gang or a double-Gang box is not necessarily required, but it is a good way to keep any wiring junctions protected from the elements. The ADC-AB102 will take the place of the usual box cover. It has a rubber gasket that seals the box opening against moisture, and it has a pre-made hole in the center that lines up with the mounting bracket of the ADC-V723. This hole allows the power wiring for the camera to pass easily through. The rubber gasket also helps to prevent moisture from getting in at the wiring point of entry.