Optional B11 mounting plate allows mounting Am51 camera onto a range of common electrical boxes: single, octagon (round), double or 4" square. Pendant mount can be achieved by combining B11 with one of the compatible electrical boxes and EMT Pipe 3/4". B11 mounting plate can also be used for surface mounting on a drop ceiling tile for added support. Install B11 on the inside of the ceiling tile, and the Am51 plastic mounting plate on the outside of the tile. Warranty: 5-year parts.