The Bose Acoustimass 300 Bass Module is designed to add deep, rich bass to a home theater or music setup. Its compact rectangular design allows it to fit easily into most rooms while delivering strong low-frequency performance for movies, music, and everyday entertainment. Item is previously owned and in good working condition. It has been tested and works properly. There are initials written on the sides of the speaker. Includes power cord — see photos for cosmetic details.