Classic Speakers are designed for use with the delta audio module EP103439 and provide full range sound to add a new dimension to your bathing experience. For use with the delta audio module EP103439 Two Classic speakers with an 8" diameter face Two RTV silicone sealant, .5 oz tubes Installation and operation manual Dimensions (L × W × H): 3-1/2" × 3-1/2" × 2-1/8"