JL Audio MHD Marine Amplifier - Combining Single Cycle Control and R.I.P.S. power supply technologies, MHD amplifiers deliver world-class, full-range fidelity and high-power output from an incredibly small package. In the Box:; MHD amplifier; Power input plug; Speaker connection plug(s); Four mounting feet; 2.5 mm Allen wrench; 4 mm Allen wrench; Four machine screws; JL Audio badge; High Fidelity Class-D Design delivers superb sonics; Exceeds International Standards for Salt Fog and UV Exposure; Manufacturer 3 Year Warranty;