Bose 251 Outdoor Environmental Speakers (Black)Bose 251 Outdoor Environmental Speakers (Black) the Bose 251 Environmental Speakers deliver full, rich sound for your listening pleasure on the deck, by the pool or on the porch. Built to withstand the elements, these award winning speakers provide reliable, year round performance that will have you humming in the sun or singing in the rain. Two 2 1 2" Twiddler drivers in an Articulated Array speaker design Lifelike stereo sound over a larger