Lutron H-MOUNT-SM Vive Hub Surface-Mount Installation Adapter.
The Vive hub provides a connection point for Lutron Vive devices such as PowPak wireless dimming and switching modules, PowPak Wireless Fixture Controllers, PowPak 20 A Relay Modules, Maestro Wireless dimmers and switches, Wireless Receptacle controls, Pico remote controls, Radio Powr Savr occupancy sensors, and daylight sensors.