Bose Free Space 51 Outdoor In-Ground Speakers (Green) Downward firing 4-1/4 full range driver.Dimensions-Each speaker:36 cm H x 32 cm W x 32 cm D Innovative radial design disperse sound in a 360 degree pattern and centrally located port enhances low-frequency performance to deliver the depth and richness of music outdoors Rugged, flexible design withstands temperatures from -40 to +150 degrees Fahrenheit, and passed the rigorous salt fog test 66% longer than required by the Marine Industry Standard Recommended power - 10 - 100 watts and withstands up to 350 pounds of pressure Base flange with mounting holes for easy installation 360-degree sound coverage for our widest outdoor speaker coverage In- or on-ground installation for landscape speaker or patio speaker placement Engineered to withstand snow, sun, rain, ice and saltwater spray