WTP Series Weatherproof Plates enable installers to flush mount outdoor horns, strobes, horn strobes, speakers, and speaker strobes to a variety of wall surfaces, including brick, ceramic tile, concrete, and masonry brick. These NEMA 3R-rated plates come in red and white to suit aesthetic and functional requirements. Compatible with our outdoor devices, which can be used in indoor and outdoor environments, as required by conditions. They easily attach to the SpectrAlert Advance universal mounting plate.