Poly-Planar's MP3 kit offers a great solution if you're looking to install audio gear into a small watercraft or off-road vehicle with limited space. The kit includes one pair of MA-4055 5" coaxial marine speakers, an ME-50 marine amplifier, and an IC-3.5PM MP3 adapter. You'll have the fixings for a neat, compact audio system ideal for a small boat or yacht tender. The ME-50 amplifier fuels the system, sending power to up to four speakers. The amp features a separate wired volume control with a 10-foot cable that puts it within close reach for quick volume tweaks. You can install this waterproof amp underneath a seat or inside the boat's body. Poly-Planar builds the waterproof MA-4055 marine speakers to stand up to the harshness of a marine environment. The polypropylene woofers feature durable rubber surrounds that can endure excessive sun exposure and moisture. Integrated grilles add extra protection against the elements, so your speakers will play reliably for years to come. The IC-3.5 MP3 adapte r lets you hook up an iPod, MP3 player, or other portable player to the amp. You can insert the rubber cover when not in use to seal out moisture. Poly-Planar includes a 4' extension cable that lets you move around your boat with portable player in hand.