The Pyle PLMRMP3B is a compact and waterproof 4-Channel Marine Amplifier designed for mounting possibilities in numerous applications and makes it simple to expand the audio system capabilities for your vehicle - perfect for your boat, ATV or RV.h Hydra Series Amplifier System comes with everything you need to give your sound system a serious boost while providing protection against the elements. Add up to 400 Watt Max power (200 watt power on each of the 2 channels). Create a fitting and truly custom installation with this sound system.This amplifier kit comes with a waterproof poly bag with 3.5mm jack so you can enjoy playing your favorite audio files from your iPod/MP3 player. The system includes RCA line inputs and the kit comes with a 3.5mm-to-RCA adaptor so you can connect your device. You can also connect standard high and low level inputs from a marine head-unit or car stereo/radio.