The Bose 151 SE environmental speakers (black) feature enhanced performance and durability for full stereo sound in a wide listening area. Sleek styling and rugged construction make these most popular outdoor stereo speakers for music around the pool, on a porch, or even on a boat. Adjustable mounting brackets allow you to hang these outside speakers vertically or horizontally, so they blend easily into your environment. The Bose outdoor speakers feature Articulated Array speaker design. Inside each speaker are three 2½" full-range environmental drivers arranged to deliver full stereo sound across a much wider area than conventional outdoor speakers.