The Poly-Planar MP3-Kit-A combo kit includes ME-52 50 watt waterproof amplifier with separate panel mount waterproof volume control knob, IC3.5-PM panel mount 3.5mm MP3 adapter for iPod® or other MP3 player and a pair of MA4055 5” coaxial waterproof speakers. MP3-Kit-A is perfect for providing stereo sound on small watercraft, Jet Skis, inflatable’s, tenders, off road vehicles, motorcycles, ATV’s and golf carts. Easily installed where space is a premium. The ME-52 amplifier can be mounted underneath a seat or inside the boat’s structure. The IC3.5-PM MP3 adapter and Volume Control can be mounted on the dash or inside the stowage compartment. This provides a convenient input for portable MP3 or CD players. And with the included Poly-Planar Waterproof Speakers, you’ll have crisp, clear stereo sound on the go!