"With Sea Sound Speakers installed in your boat, you can relax or party - listening to your favourite music. Ideal for use in boats, since they are water (31302 & 31303) and corrosion proof. There are two types of speakers available; the 2-way and 3-way speakers. The 2-way speakers may be mounted both indoors and outdoors. On the other hand, the 3-way speakers should only be used inside the boat and can be mounted either horizontally or vertically allowing the speakers 360o of movement. The 3-way speakers are available only in black and the 2-way available only in white."