Articulated Array speaker design includes precisely positioned drivers to provide a large, consistent sound field for outdoor listening Glass-filled polypropylene cabinet provides added yearlong protection against weather extremes. Withstands humidity and fog. Mount horizontally or vertically with included brackets/hardware Adjustable installation allows you to mount these exterior speakers horizontally or vertically depending on your preference Stereo Everywhere speaker performance produces balanced stereo sound over a wide area. The result of proprietary Bose technologies, these speakers let you enjoy balanced sound throughout the listening area, unlike conventional speakers that radiate sound mostly in a single direction Full-range glass-filled speaker cone (2.5") offers reliable, high quality sound reproduction across audible frequencies—even under extreme temperature and weather conditions Engineered and tested to withstand snow, rain, salt and temperature extremes of -40 degree F (-40 degree C) to 158 degree F (70 degree C) Slot-port tuning reduces air turbulence for cleaner and deeper reproduction of music's lower notes The Bose 151 SE are elegant, weather-resistant outdoor stereo speakers designed to blend into outdoor environments, available in black.