New and unused. The Extron SMB 100 Series Surface Mount Boxes are designed for the external mounting of almost all Extron architectural products, including wallplates, AAP - Architectural Adapter Plates, and MediaLink® Controllers. Each box is designed to be surface mounted on a tabletop or wall for convenient access to connectors and controls. The back and bottom of the boxes feature AAP openings. The quantity of AAPs that can be installed varies with the size of the box. Blank AAP panels are included to fill unused openings.