Oval Waterproof Pop-Up Spa Speaker - GrayMA7020 is an oval pop-up speaker designed to provide a waterproof speaker for a spa. Pop-Up when in use and unfold when not in use or when the spa is covered. The materials used are carefully considered to resist spa chemicals, corrosion and UV rays. Features: Waterproof Design, 2-Channel Speaker, Precise Fit, Flush Mount, Installation Depth: 400mm. It sells like a sop