Drywall Backer Box.

This is a type of electrical box used to support and secure electrical outlets or switches in drywall installations. It’s typically used in new constructions or renovations where a traditional electrical box might not be suitable. The backer box is designed to provide a stable mounting surface for the electrical device and to ensure proper alignment with the drywall surface. It often includes features like adjustable depth to accommodate different drywall thicknesses and to facilitate a secure fit.